If a new eufy SmartTrack Card E40 won't pair, charge it, turn on Bluetooth and Location, close other tracker apps, then pick one network: Find My on iPhone or Find Hub on Android.
A fresh eufy SmartTrack Card E40 that won't connect is almost always a setup-flow problem, not a dead card. As Android Authority's hands-on with the E40 notes, the tracker "supports both Google and Apple" finding networks, and that dual-network choice is exactly where most first-time pairing failures begin.
- You pick one network at setup -- Apple Find My or Google Find Hub, never both, and the card is invisible from the other app.
- Bluetooth plus Location are both required -- the E40 can't be detected with either toggle off, even when fully charged.
- The card must hold a charge -- a Qi-rechargeable E40 shipped months ago can arrive too low to complete a handshake.
- Other tracker apps block the popup -- close the eufy app and rival tracker apps so the system setup sheet can appear.
- A factory reset is the last step -- holding the button clears a half-finished pairing so you can start over from scratch.
The seven fixes below walk through E40 pairing failures in the order they actually happen, starting with the network choice and the setup popup, and ending with a full reset. If the card pairs but later loses location, that is a separate offline-finding issue covered elsewhere.
Which Network Do You Pick at Setup?
The single most common reason an E40 "won't connect" is looking in the wrong app. The E40 is a dual-network card, but it joins only one network at a time, so a card claimed in Apple Find My is completely invisible from Google Find Hub, and the reverse is equally true.
Android Authority's launch coverage confirms that the $34.99 E40 "supports both Google and Apple" networks, yet eufy's own product spec is explicit that you choose one at setup, and switching later forces a reset and re-pair. When we tried adding a card already claimed in Find My to a Pixel, Find Hub never saw it at all until we reset it. Before assuming the card is broken, confirm you're even pairing it in the right place.
On iPhone, add it through Apple's native flow. According to Apple's guide to adding a third-party Find My item, you open Find My, choose the Items tab, tap the plus icon, and select Add Other Item, then place the card next to your phone. In our testing, holding the E40 within a few inches of the phone for the whole flow was the difference between a clean add and a stalled one.
On Android, the E40 is added to Find Hub through Google's setup sheet, then managed in the eufy app afterward. Pick the network that matches your daily phone: an iPhone household should set the E40 up in Find My for the widest finding network, while a Pixel or Galaxy owner should use Find Hub. Choose deliberately the first time, because moving the card between networks means resetting it.
Why Won't the E40 Pairing Popup Appear?
When the setup popup never shows, pairing stalls before it starts. On Android the E40 relies on a system setup sheet that fires the moment your phone detects the card, and that sheet won't appear while another tracker app sits open in the background. Start with the basics in this exact order: turn on both Bluetooth and Location, then fully close the eufy app and any rival tracker app, since a foreground app can suppress the system sheet entirely.
Place the card next to your phone and trigger setup again. If the sheet still does not appear on Android, enable Scan for nearby devices under Settings, Google, Devices and sharing, because Fast Pair detection carries the whole flow, and a disabled scan toggle leaves the card invisible to the system. As a fallback, restart the phone, wait two minutes for services to load, and try once more.
Multiple cards nearby can also confuse the handshake. eufy's SmartTrack setup-failure guide states that if you have several trackers to set up, make sure that "only one is near your device at one time" so the phone pairs with the card you actually mean to add.
Charging the E40 Before Your First Pairing
Unlike a coin-cell tag, the E40 ships with a Qi-rechargeable battery, which means a card that sat in a warehouse for months can arrive too low to pair. A near-dead E40 can light up briefly and even start a handshake, then drop off before setup finishes, which reads as a connection failure when it's really a power problem.
Put the card on a Qi wireless charger for at least 30 minutes before your first pairing attempt. Confirm it responds before retrying setup, since a reset or pairing on a flat card will never complete. eufy rates the E40 at roughly five months per charge, so once it's topped up you should not need to think about power again for a long time.
If the card never shows any sign of life on the charger, that points to hardware rather than pairing, and you should contact eufy support before retrying the same steps. The card's broader feature set, including its 100 dB alarm and IPX5 rating, is covered in our hands-on eufy SmartTrack Card E40 review if you want to confirm what working behavior looks like.
App vs Network: Why the eufy App Alone Won't Connect
A frequent point of confusion is treating the eufy app as the place where the card connects. It isn't. On Android, the E40 must join Find Hub through the system setup sheet first, and only then can you add it inside the eufy app. On iPhone, the card lives in Find My, and the eufy app is an optional companion layered on top.
The setup popup can mislead you into thinking the card was added everywhere at once. In reality it only joined the finding network at that step, and the eufy app needs a separate add. If you skip that order, the eufy app simply won't find a card that isn't registered with the network yet.
The eufy app is optional for core locating but worth adding for extras like separation alerts and a louder ring. If you only care about finding the card, Find My or Find Hub alone is enough, and a missing eufy-app connection is not actually a failure. If your card pairs but never reports a fresh location, our guide on a Find Hub tracker not updating walks through the offline-finding settings that control that.
Factory Resetting the E40 as a Last Resort
If the popup appeared but pairing never finished, a half-completed registration can block every retry. A factory reset clears that stuck state so the E40 can start fresh. Treat it as the last move, because it wipes any partial setup and forces you to re-add the card as a brand-new item.
Step 1. Make sure the card holds enough charge to respond, since a reset on a flat E40 won't complete.
Step 2. Press and hold the E40 button until it signals the reset, following eufy's reset sequence for the SmartTrack Card so you don't release too early.
Step 3. Close the eufy app, then re-trigger the setup sheet on Android or Add Other Item on iPhone, and add the card again from scratch in your chosen network.
If you are switching the card from Find My to Find Hub or back, this same reset is the only path, since the E40 can't live on both networks at once. The principle is the same one we cover in our guide to resetting a Find Hub tracker, which lines up the button timing for rechargeable cards alongside other dual-network tags.
What to Do If the E40 Still Won't Connect
If you have charged the card, toggled Bluetooth and Location, closed competing apps, enabled nearby-device scanning, restarted, and reset, and the E40 still won't pair, check that your phone meets the floor. Find My needs an iPhone on a recent iOS release, and Find Hub needs an Android phone with Google Play Services and the Find Hub app set up. An older or stripped-down phone can block the setup sheet entirely.
A card that responds on the charger but never raises a popup or appears in either app may have a hardware fault. At that point, contact eufy support so they can confirm whether it's a warranty case rather than retrying the same steps.
If you're still deciding whether the E40 fits your phone, the Find Hub tracker hub compares it against the other rechargeable cards on Android, and our Chipolo LOOP pairing guide covers the same one-network-at-a-time trap on a rival dual-network card.
Bottom Line
An E40 that won't connect is nearly always a setup-flow issue, not a defect. Charge the card, turn on Bluetooth and Location, close competing tracker apps, and pick one network at setup: Find My on iPhone or Find Hub on Android. Remember the E40 joins only one network at a time, and reset it only when a half-finished pairing or a network switch blocks every retry.
FAQ
Can the eufy SmartTrack Card E40 connect to both Find My and Find Hub at once?
No. The E40 is a dual-network card, but it joins only one network at a time, either Apple Find My or Google Find Hub. A card set up in Find My is invisible from Find Hub and the other way around. To move it between networks you must factory reset the card and add it again in the other app, so pick the network that matches your everyday phone at setup.
Why won't my E40 pairing popup appear on Android?
The setup sheet won't appear while the eufy app or a rival tracker app is open in the background, so fully close them first. Then confirm Bluetooth and Location are both on, enable Scan for nearby devices under Settings, Google, Devices and sharing, and place the card next to the phone. If it still fails, restart the phone, wait two minutes, and try again.
How do I add the eufy SmartTrack Card E40 on an iPhone?
Open the Find My app, choose the Items tab, and tap the plus icon. Select Add Other Item, then place your E40 next to the phone so it's detected. Follow the prompts to name the card and assign it to your Apple ID. For extras like separation alerts, open the eufy app afterward and add the same card there as well, though it's optional.
Does the E40 need to be charged before I can pair it?
Yes. The E40 uses a Qi-rechargeable battery, and a card that shipped months ago can arrive too low to complete pairing. Put it on a wireless charger for at least 30 minutes, confirm it responds, then retry setup. A near-dead card can start a handshake and then drop off, which looks like a connection failure but is really a power problem.
Do I need the eufy app to connect the E40?
Not for basic finding. On iPhone the E40 works in Find My alone, and on Android it works in Find Hub alone. The eufy app adds extras like separation alerts and a louder ring, but on Android it can only be added after the card is already on the network. So an E40 that locates fine without the eufy app is not actually failing.
How do I factory reset the eufy SmartTrack Card E40?
First make sure the card holds enough charge to respond. Press and hold the E40 button until it signals the reset, following eufy's reset sequence so you don't release too early. Then close the eufy app and re-trigger the setup sheet on Android or Add Other Item on iPhone to add the card as a brand-new item in your chosen network.
What phone do I need to connect a eufy SmartTrack Card E40?
For Apple Find My you need an iPhone on a recent iOS release. For Find Hub you need an Android phone with Google Play Services installed and the Find Hub app set up. An older phone or one missing Google services can block the setup sheet entirely, which is a common reason a brand-new E40 refuses to pair at all.
