MwSt.-Nummer entfernen

Tobias, in addition to the helpful information provided by Kglad, please see https://helpx.adobe.com/de/manage-account/using/update-vat-id-for-eu-countries.html which discusses how to add or remove a VAT ID to your account.  

If you have questions or would like assistance with the process, please don't hesitate to begin a secure chat session https://helpx.adobe.com/contact.html?rghtup=autoOpen.

from another user:

1. Get into Manage payment popup
2. Switch method to Paypal from dropdown
3. Remove VAT ID at the bottom
4. Hit Sign in button, you will be redirected to Paypal login page (or Paypal if already logged)
5. Without even logging in, find and click a little "Cancel and return to Adobe (...)", you will be taken back to Manage payment popup
6. Fixed, no more VAT ID and your Credit Card info are still in place 

also, use a different adobe id to create a new subscription unassociated with the past subscription