Hello, my name is Daniel. i received a letter from the immigration authority in my locality that, I should bring my nation passport after three months of duldung. Now I have two children all born in Germany, and my wife is from another country but we are living together in Germany. My children decision is in BAMF. and my wife is appealing in the administrative court. I have all the necessary documents that shows that I'm the father and also the custody right. the ausländerbehöde already have my birth certificate, and now they gave me two weeks to provide a passport. Please can I know the reason why I need to submit my national passport to them?