Problem with 2-factor authentication

What I’m trying to do

I purchased a new iPhone and copied from the old phone. All active authentications in MS Authenticator no longer work (including Obsidian).

Things I have tried

This page. Does not indicate what to do in such a situation, or if it does, I don’t get it! For example, I cannot login to my Obsidian account, as 2-factor is set, but my authentication application on my phone is no longer connected to my Obsidian account.

Thanks in advance, Mark

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