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Re:Your Android Phone Is a Security Key by krzyk on Wednesday April 10, 2019 @03:23PM (#19627920)
SMS and authenticator won't work on a dead phone either, so you are left with keeping a paper with backup codes.
Re:Your Android Phone Is a Security Key by henryfjordan on Wednesday April 10, 2019 @03:37PM (#19628048)
Or a second key.

What happens when your first and only Yubikey gets dropped in a puddle? You're also back to paper and backup codes.

Re:Your Android Phone Is a Security Key by macspoofing on Wednesday April 10, 2019 @03:33PM (#19628003)
>so you are left with keeping a paper with backup codes.

It's not magic, there isn't any other way.