I am living in Berlin on the Opportunity Card visa and am looking for advice on how to convert this to a Residence Permit in order to work as I will be receiving a job offer. However, I am unable to get Anmeldung at this time as the apartment I am living in will now allow me to register my address here. I'm afraid this will prevent me from working if it is a requirement to have Anmeldung to get my residence permit to start work.
Does anyone have any advice on this topic or know if there is any way around this? What I can provide is a written contract from my roommate (whom I am subletting, so not officially from the owner), and maybe make an Anmeldung appointment in the future to be able to say for my residence permit application that I haven't been able to get an Ameldung appointment yet but I have a rental agreement and will apply for the Anmeldung soon. Would this suffice, or is official Anmeldung absolutely required?