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I don’t see any such option on the iPhone. Also it’s a problem if you lose your phone before you make any transfer.

The previous answer made me think a bit more seriously about those reset codes that are lying around (maybe?) my computer.

I’m a digital native and digital lives are still so hard even for me; no wonder regular people just nope out of it.

There's a 2 dollar app on iOS called Authenticator Plus that syncs to iCloud, that's my present solution.

How do you know that app can be trusted with your secrets? - is it OSS?

I don't. That's the rub with anything iPhone/iPad. Ultimately I'm at the mercy of Apple's app review process.

Duo is free and also syncs to iCloud