@ygrex I suggest you look at

https://forums.ubports.com/topic/7283/anbox-support-for-the-fairphone-3-3/2?_=1673700715553

Use Waydroid in preference to Anbox.

Having said that I haven't installed either. I tried Waydroid using Waydroid Helper from OpenStore but I somehow managed to almost brick my Volla Phone X and lost all my data getting it working again. I'm sure it was just me doing something stupid, but be careful.