I had a similar issue, my maps wouldn’t work on MMI. Kept coming up ‘initialling database’ but would never leave that message.
took mine to Audi and they reinstalled the maps, though it took them some time as they had to do a full reconfiguration of the MMI. I’d suggest booking it in with Audi under warranty and it’ll probably go through the same reconfiguration process. If you’re worried about any potential costs I’d tell them when you take it in to not do any work that’s gonna cost without your authorisation.
From what I can gather all updates on the MMI go over the air, if updates get interrupted they can become corrupt, which will affect the MMI. My mate has a 2022 A6 BkEd and his has been in 7 times with MMI failure.
Hope this helps