Welcome to the Wefugees Community and thank you for reaching out to us.
People can get the “erweitere Meldebestätigung” (extended registration certificate) at the local registration office (i.e. Bürgeramt or Einwohnermeldeamt) and compared to the simple registration certificate, it may contain additional data. These data includes details on gender, legal representative, current nationalities, legal affiliation to a religious community, previous address(es), date(s) of moving in and out, marital status, data on spouse or civil partner, data on minor children, data on identity card, recognised passport or passport replacement document, eID card and proof of arrival in accordance with the Asylum Act as well as the AZR number. Data on information and transmission blocks may not be included in a registration certificate (information from this website of the Bavarian authorities).
As long as you are officially registered in a municipality, I don’t see a reason why you may not be able to get the extended registration certificate. Do you agree dear @mbeon-Gabriele or @mbeon-Ruth?
All the best,