Android settings that may prevent BT4WA from working

Android > Settings > Apps > backgroundTracker4WebApps > Permissions > Location:

Should be set to "Allow all the time"

Android > Settings > Apps > backgroundTracker4WebApps > Battery:

Should be set to "Unlimited"

Android > Settings > Location:

Should be enabled

Android > Settings > Location > Source:

On Android 11 and older one can choose how the location should be acquired. It's a bit uncertain if all combination works, I recommend the user to use "network+device". The other settings may work. Please report a bug if you find that any of them doesn't work.