Dear @Rana, I don't think you need to worry about the AZR-number. As far as my research went, "AZR" stands for "Ausländerzentralregister", the central register for foreigners in germany. This register is meant to be used by different authorities and offices of the german administration, in order to access the same data. If e.g. an office needs to look up your case, the "AZR-number" allows them to find your case and the according data. Here you find more information about the AZR number: https://www.bva.bund.de/DE/Das-BVA/Aufgaben/A/Auslaenderzentralregister/azr_node.html (the page is in german) Does this answer your question?