I've had that problem twice.
Back in November '21 the Shop (the icon) disappered after the error "Unable to start app". (This was with software version 1806.)
I tried to restore factory settings but that did not help and I ended up not being able to register myself as the main user as the Shop app is missing and it is done through it.
After that I got a new MIB3 unit for my car as instructed by the Skoda and I was finally able to make my account as the main user once again as I used to.
Eventually..
January '22 came and I got hit by the same error once again.. (software version 1810) no more Shop app (or any other app which is available through Shop.. like Traffication or Calendar).
Skoda requested me to record a video of the issue (https://www.youtube.com/watch?v=pZWTiaD88Ho). The "Unable to start app" can be seen at 5:00 on video.
Since then I have visited the workshop couple of times and they do not have a clue about the root cause of the issue and neither does Skoda.
It is probably a software bug but getting it fixed is an another thing.