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Are you using a VPN? When I have issues like yours (not necessarily FindMy) it's usually the VPN blocking stuff. Just putting out there for you. Hopefully you'll get it sorted there's nothing more frustrating than something that should 'just work' and it doesn't.
No VPN.

Thanks for your kind words.
 
I had this problem too (went almost crazy ...) and finally solved it following these steps:
  1. open Terminal:defaults read MobileMeAccounts
  2. sudo diskutil verifyVolume /
  3. power off Mac and long press power button, get into the Disk Utility, click the First Aid to the System Data Disk, then restart the Mac
Hope it helps
 
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I had this problem too (went almost crazy ...) and finally solved it following these steps:
  1. open Terminal:defaults read MobileMeAccounts
  2. sudo diskutil verifyVolume /
  3. power off Mac and long press power button, get into the Disk Utility, click the First Aid to the System Data Disk, then restart the Mac
Hope it helps
Thanks, I’ll try.

I’ve already tried First Aid, also in Safe Mode.
 
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