I treid to add a second module on configuration.yaml without success…
- type: totp
name: "Google Authenticator on Android"
- type: totp
name: "Microsoft Authenticator on iOS"
Received error: Duplicate mfa module totp found. Please add unique IDs if you want to have the same mfa module twice for dictionary value @ data[‘auth_mfa_modules’]
For what would you need a second instance? Every user can add its own token in their user-menu with just the single configuration.
If your plan is to generate the token on multiple devices, delete the old token, create a new one, then scan the code with both devices. And you can even copy the secret displayed below the QR-Code and use it with password managers to create authentication pins as well.
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Can confirm, this is what I do. Bitwarden + 2 other backup totp authenticators.