Dear Scoboyi john,
Welcome to the Wefugees Community and thank you for reaching out to us.
It is a normal procedure that the immigration office is asking Duldung holders to clarify their identity/submit their passports. In case people are not cooperating with the immigration office, they even might get issued a so-called "Duldung light" according to section 60b of the German Residence Act. I would recommend you to contact a migration counselling office first to discuss your individual situation and potential risks for you and your family. Unfortunately, it is hardly possible to give general advice on your next steps without knowing your circumstances and your background.
Please let us know if you need support in finding a respective counselling organisation in your area.
All the best,