I'm applying for a family reunification visa to join my wife in Germany. I am an Indian national resident in the UK. I will get to keep my passport since the processing time is over six weeks. I also have a valid Schengen visa.
Can I use the Schengen visa to visit her while my family reunification visa is being processed?
I don't see anything explicitly forbidding it but I believe other countries don't allow it. What is the case for Germany?