Hey there @Sohab,
Nice to see you are such an active member of our community!
When I was looking up the required documents to apply for family reunification at a German embassy/ consulate, I couldn't find anything called "BMAF deed". The first word is probably supposed to mean "BAMF" - which is the Bundesamt für Migration und Flüchtlinge/ Federal Office for Migration and Refugees.
The following website explains in detail which documents you need to hand in and how to apply (please scroll down to Germany Family Reunion Visa Requirements):
I hope this help. You can also try to contact the embassy again, to make sure you understand the requirements correctly.
All the best,