Apple has TOTP support built in now. These instructions are kinda terrible, but it boils down to this: when you get a QR code to scan to enroll for MFA, control-click or long-press on it, and add it to keychain.
Once that’s done, keychain can auto-fill TOTP codes along with passwords.
So long, Google Authenticator
https://support.apple.com/guide/iphone/automatically-fill-in-verification-codes-ipha6173c19f/ios
@jmbwell I’m slowly moving away from g-auth, but splitting to 1p. Apple’s take still feels a little immature and not necessarily multi-platform convenient. It’s nice though!