@ROCKKER-55 I may try to make them answer my questions, specially when that answer may be important.
If you think that I'm not helping, you can just wait to see if someone else shows up with a possible solution.
So after getting rid of opera following my last post, I read about Opera 60 and the QR code sync and thought maybe they had fixed the issue. So I reinstalled and signed up for new opera account.
sync.opera.com and the devices still shows open tabs between desktop and mobile devices, but not history.
The QR code thing is useless. I go to opera.com/connect on the desktop, scan the QR code with my phone, and the numbers don't match. After that, it only pulls up another QR code on my phone which it wants to me to scan. Um, I can't scan QR codes with my desktop. So the only option is to log in to an account.
So basically "history sync" is fake functionality. I guess it falls into the "fool me twice" category so shame on me.
Goiodbye Opera. For good this time.
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
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
The system is:
Android 10 | Xiaomi RedMi Note 7 Pro | MIUI 12
Windows 7 | Opera 70.0.3728.95 and above
Everything happened since the Flow activation