I live in Hamburg. I have a blue card. My wife submitted an application to join me here in Germany. After a few weeks, I received a letter indicating that I need to submit some documents, including proof of space.
First, I will start with giving a little bit of a background to explain the situation. When I came here to Germany, a few months ago, I found a flat via Airbnb to live in temporarily. Then I made a deal with the "owner" of the flat to rent the flat for a long duration and to provide me with a rental agreement (Mietvertrag) needed to sort out my papers.
Now when I tried to submit these documents as a proof of space for my wife to be granted a visa and join me, I discovered that my landlord himself is (permanently) using this flat and that it belongs to a housing cooperative. So the visa office asked me to provide a confirmation that the housing cooperative are aware about and okay with this subletting. I am not sure if they are (I did not know whether they exist), and I have less than two weeks to send this confirmation (they are not enough to find a new flat and get a new residence certificate with the new address). And my landlord is not answering my messages (yet).
What do you suggest I should do?
PS. the space is enough to accomodate me and my wife. I live alone in the flat and have a rental agreemenet signed by the (sub-) landlord and me, which I sent to the visa office.