thanks for contacting the wefugees community!
You received a so called Dublin-Decision, that is the BAMF found out that another country is responsible for your asylum process. So from the time this decision becomes final you are obiligated to leave Germany. People who are obligated to leave Germany have a "Duldung" instead of a Aufenthaltsgestattung. This is why the foreigners authority wants to change your documents. This is not saying that they will deport you directly, but of course it is their job to try. Unfortunately I cannot tell you, what will happen in your case. What I can say, that in many cases deportations to Dublin-states don't happen. Either because german authorities don't have enough staff or because the other country doesn't support the deportation process. Anyway, Germany has only six months to deport you to the other country. If they don't make it, Germany becomes responsible for your case.
I hope I could answer your question.
Note: This is a general information and cannot replace qualified legal advice.
Please feel free to contact me again. My name is Ruth and I am a professional refugee advisor. In case you need a confidential consultation you can write me via the app ‘mbeon’, which provides advice for adult immigrants in Germany. Download the app at Google Play or App Store and get in touch with me or 160 other migration advisors. It's free of charge, anonymous, data secure and you can get advice in 15 different languages. Find more information here: www.mbeon.de.