At least 1 of our team had to hand in their Anmeldebescheinigung to get their Bescheinigung des Daueraufenthalts. In my case I had to hand in my Anmeldebescheinigung to get my Article 50 card (5 year). It seems like there is no consistent way of handling this. At least you got the card now. If you have not done so already, can you complete one of our Feedback forms: https://www.britishinaustria.net/a50-all-feedback/ It helps us keep track of any issues!