If it's still in warranty you might have to get that repaired.
Had the same problem, about 6 months after I bought it, the standard rear camera could no longer focus, except for really short distance ~ 30 cm.
After trying all of the internet suggested tips, all the way to up to factory reset it was clear to be hardware failure. In this case I bothered with the factory reset, because that's part of the warranty procedure anyway.
Apparently that camera is attached to the phone hull with some kind of tape which might loosen or break. Which gets the camera out position it needs to be in to focus.
No complaints about the repair. Pickup-repair-return in 48 hours. The repair left a small mark on the plastic rim of the phone (looks like they have to pry it open, not really made for easy repair), but in exchange for a working camera, that was fine for me.
Do note, repair also means you get the latest software version and I had my share of problems with the Android 11 OneUI 3.1 update. It's good in general, but Google changed the split screen concept and also seems to have some WiFi fragility which I deem is related to IPv6 connectivity problems of certain home networking appliances. With enough effort you can get around some of it, but just be warned (if you have solid IPv6 connectivity there's a chance you don't face that problem).
