Within the Authy iOS app one or more accounts can be “corrupted” and you will be presented with the following message text with an option to restore:
The token is corrupted. Please tap the button to ensure your Authy account is restored and all your tokens work correctly.
This might happen because:
- An error during decryption from a backup, which causes the local decryption to be invalid while the backup is still fine.
- A device specific issue.