Welcome back to the Wefugees community and thank you for reaching out to us.
Unfortunately, I’m not very knowledgeable regarding these car-procedures, but I assume the details will vary from city to city.
You may want to check the website of the “KFZ-Zulassungsstelle” in Lübeck for more information which includes contact details and a phone number as well.
I hope this helps.
All the best,