i don't know anymore, it has been over two years since i have been there.

"are they handling government registration for you?"
Yes exactly this

It could be tagged as this, but it is a private service provider and not a government service.

it is not a shop in the common sense, because then i would just have added it as a shop.
it is a vehicle registration service, that is a category that is no really documented in OSM, that is why i added the fixme tag.

Ich habe die aber nicht hinzugefügt, sondern nur Details ergänzt.