2x's Authenticator Help?
Though it's not ideal as it can increase the possibility of your account being compromised if you lose one or the other, as long as they are based on the same platform (both Apple or both Android) I don't see why you couldn't just enter the same serial information on both items using the Restore feature. Since the serial information is what's linked to the account you should then be able to use either one to log into the account.
I don't know that this will work for sure but it's worth trying.
Yes, it is possible to place your serial on as many devices as you'd like.
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