Whom can I contact if I have questions about using the OZG-RE or if I have issues?

A support service is available to answer your questions about using the OZG-RE or if you are having issues.

It can be reached by email or by telephone:

Support and service for invoice recipients (authorised users):

Contact form

call +49 30 2598 4430

(Mon.-Fri. 08:00 AM – 04:00 PM)

Support and service for invoice senders:

Contact form

call +49 30 2598 4436 anrufen

(Mon.-Fri. 08:00 AM – 04:00 PM)