I got a Schengen visa from the Belgium embassy with a validity of 21 days but for a 7-day stay. I got my passport late from the embassy and my approved leave was over already due to the delay in the application process. My travel dates were from August 6 to August 12, but I got my passport on August 17, with the validity until September 5.
I am unable to travel due to unavoidable circumstances. Will it be a problem for future applications if I don't use this visa? By the way, this is my second Schengen visa. I already used the first one a year and a half ago.