Hey everyone, if you've been dealing with the absolute nightmare of your Garmin watch suddenly disconnecting from iOS, refusing to sync data, and giving you the constant "Pairing Failed" or "No Accessory Found" screen even after doing a factory reset, clearing Bluetooth cache, and deleting the app , check your other health apps.
The Hidden Conflict: I realized that thirdparty metric and recovery tracking apps (in my case, Bevel) maintain a deep, silent background lock on the watch's hardware profile through Apple Health. Even if you wipe the watch from the Garmin ecosystem and native iOS Bluetooth settings, these apps keep the Bluetooth lane occupied, preventing the watch from sending a clean pairing broadcast.
How I fixed it:
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Completely uninstall third-party health apps (like Bevel) from your iPhone.
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Put your Garmin back into manual pairing mode (Hold UP > Connectivity > Phone > Pair Phone).
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Open Garmin Connect and search for the device. It should instantly pop up and pair perfectly on the first try.
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Once the handshake is fully established and syncing, you can safely reinstall your other apps.
Hope this saves someone the hours of pure frustration I just went through!