Welcome back to the Wefugees Community and thank you for your question.
We discussed the so-called "Ausbildungsduldung" already many times on this platform. You may, for instance, want to check this thread for more details. In sum, when you meet all requirements the immigration office (Ausländerbehörde) has to issue the Ausbildungsduldung. As far as I know, the most difficulties come up when applicants can not sufficiently (in the eyes of the immigration office) prove their identity. You will find information on this following the mentioned link as well.
Good luck with your application and please don't hesitate to get back to us with any further question.
All the best,