I have two passports. My old passport was made in 2014 and it is to expire in July 2020. It is empty with no visas on it. I wanted to apply for a 2-year Master's program in Germany that will start in October 2018.
However someone told me my passport should be valid 6 months after my intended return date. So to stay on the safe side, I applied for a new passport a month ago and my old one has been cancelled. They put a stamp on it that a new passport had been issued.
Now the new one is the one I have to use. Will it create any problem at the German embassy? Will they ask why I got a new one while the old one was not yet expired? I will carry both passports on my interview day, but could this be a cause of visa rejection?