After installing EFI iCloud Acesse dropped

Dear all,

I tried to update my late 2015 iMac. After modifying the boot section I normally booted to the desktop, but now all desktop icons are gone :) and most iCloud services are greyed out:

https://preview.redd.it/xjqrvhrmtkse1.png?width=206&format=png&auto=webp&s=21e8b0ccad79a7970a7cbe8b62aa7f2c17d9c0a5

Guess I missed something?!

Best
Ralf