Signed out by the device limit
Signing in on another device signs out the one you used least recently.
Your account stays signed in on a limited number of devices at once. Signing in on one more signs out the device you used least recently — FirdawsWay names it on the new device and emails your account.
Not you? Sign in, remove the device you don't recognise from Logged-in Devices, and secure the email, Google or Apple account you sign in with.
In the appOpen Logged-in Devices
The device that was signed out keeps working, and nothing on it is erased. Sign in there again to sync — the least recently used of your other devices is then signed out instead.