Thanks @bartoque for sharing that, I also thought to do that, but I was afraid about if backup with invalid dates failed. Anyway, hope to get it fixed in next update, yeah but aesthetically and logically backup looks ugly without dates.
Why Microsoft authenticator Backup creation date and Updated date showing invalid.

After creating backup in Microsoft authenticator app, when I am checking details of backup the date of creation and last update date is showing as invalid.
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bartoque 96 Reputation points
2022-06-22T13:50:04.587+00:00 It is working again as before after the June 22nd update of the app. Now actual timestamps are being reported, no longer any "invalid date" message being mentioned.
Haven't tested a recovery on a 2nd device yet with the latest version (which I tried earlier on, which worked, even when the invalid date was reported on my phone, recoveey on a table worked with the previous version).
Really looking forward also to improvements like keeping entries in sync on multiple devices, as that would make life even easier. Also would people have validating things are the same. Might not wanna perform a recivery for recovery's sake, to find out that the backup was no good on your primary device.
I also don't know why a backup is restricted to using a private MS mail address only and not any other selectable cloud account? Or to be able to migrate between android and iphone (using icloud instead of MS mail account) transparently?