homa your output shows no devices available. Either something is not supported or some configuration issue.
It seems that Google Find My Device doesn't work for the Russia and this is google's restriction:
https://support.google.com/android/thread/341820687/find-my-device-network-%D0%BD%D0%B5-%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0%D0%B5%D1%82-%D0%B2-%D0%A0%D0%BE%D1%81%D1%81%D0%B8%D0%B8?hl=ru
https://4pda.to/forum/index.php?showtopic=526450&view=findpost&p=133341443
That's unfortunate. Sounds like you won't be able to use it then.
I have confirmed that shared devices work. I shared a tag from my personal account into the account used for our testing. It took a few minutes to work, but the tracker can be seen by the microservice.
could my problem be related to google famili link? My account is parent for children in google famili link. When I login to google account in ChromeDriver in AuthFlow, google ask me "who will use this device" and I can chose "I'm" or "child". I can see all my devices location at https://www.google.com/android/find/ but I doesn't see available devices in main.py's output