Tethering not working (any more)

hello, I have a same setup for (at least) 3 years now: Mikrotik hAP ac lite Android Mi A2 and then I enable USB tethering on the phone. For some reason now on phone USB tethering is disabled (grayed out).

Additional notes and what I tried:

• USB cable is good, if I connect to PC “tethering” is enabled
• during previous working time and now I lend MT to I friend and he updated it to v7
• before that I also made a backup of my setup
• FWs I tried (nothing works)
  • v6
  • v7
  • v7 beta
• On phone a see that last update was in 2021 and there is no other updates
• also phone was completely restarted/formated

Any ideas what else I could try or how can I debug