otpauth VS Aegis

will generate a PNG file for each account, name after the account name and site name, and containing the QR code for the account.

Going forward, save those PNGs somewhere secure (I use an encrypted tar file). Any new accounts you set up save the QR codes for those as PNGs and add them to your collection. If you keep that collection up to date you will be able to readily handle any device updates or replacements readily or adding new TOTP apps.

[1] https://github.com/dim13/otpauth

afterwards you can use https://github.com/dim13/otpauth to convert the GAUTH code to plaintext

Open google authenticator, export accounts, screenshot QR code, decode with cyberchef, decode otpauth-migration link with https://github.com/dim13/otpauth

Scan the code with something else and pass the string inside to a tool like this in order to get the individual tokens/codes: https://github.com/dim13/otpauth

latest google authenticator has an export option. save the url or QR code and you will be able to load it in the next phone (or use a tool such as https://github.com/dim13/otpauth / https://github.com/digitalduke/otpauth-migration-decoder to decode the keys/timers and load in TOTP inside keypassx etc')

The code on this page is a standard otpauth string.

Not tested yet but this tool should allow you to create scanable QR codes for other auth apps as far as I understand. https://github.com/dim13/otpauth

For 1Password I use a Yubikey, but for 2FA in general, I have a backup phone running Aegis[1].

[1] https://getaegis.app/

Bottom line is, why in the world would you use a mysterious closed source app when there are better options out there? 2FAS is one of the better ones. Aegis Authenticator is another good choice for Android devices.

You can enable 2fa with amazon I suggest you do that with a 2fa app like aegis, that will greatly increase the security of your account and require the 2fa code to login to your account.

Aegis Authenticator has been a lifesaver for me: https://getaegis.app/

I use Aegis[1] on mobile and OTPClient[2] on my computer, both are regularly backed up on change.

I do not use the TOTP feature in my password manager (though I can split it to new DB in keepassXC) as feel it will defeat the purpose of 2FA.

[1] https://github.com/beemdevelopment/Aegis

Google Authentificator → Aegis