thank you for sharing your question with the Wefugees Community.
What do you exactly mean by your first name and last name written as +?
I assume you mean, that the Foreigners Office (ABH) has written your first name and last name togetter and in your passport there is a space between these two.
Anyhow, whatever the case might be, for the Foreigners Office your passport and your birth certificate are the basis, on which they write and then correct your name if they have made any mistakes while issuing your Ausbildungsduldung. So you can go to the Foreigners Office with your passport and if available take your birth certificate also with you and ask the Foreigners Office to correct your first and last name in your Ausbildungsduldung the way they are wirtten in your passport and in your birth certificate.
I hope my answer was useful for you and I'll be very pleased if you contact me again with further questions. I'm a member of the MBEON-staff and I‘ll be glad to guide you over a longer period of time. Mbeon is an online consultancy for migrants via the mbeon-app, which you can install on your smartphone for free. Download it via App Store or Google Play Store. You'll find me In the mbeon-app under my name „München, Herr Noori“ and get confidential one-to-one advice in a safe virtual room where nobody can wiretap messages. Further information: www.mbeon.de
With kind regards,