Hi,
After tests and continued Sync problems, it seems fixed:
Clean 60 Android still gave the Error
Clean 59, Set up - Ok, then Update to 60 worked
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Still had a problem related to Tabs not Synced, so needed to Reset Sync Data.
Since on 60, the Passwords error was repeated, even on Reset Local Data, so, again:
Clean 59, Set up - Ok, then Update to 60
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The system is:
Android 10 | Xiaomi RedMi Note 7 Pro | MIUI 12
Windows 7 | Opera 70.0.3728.95 and above
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Everything happened since the Flow activation