Same problem but with Sinopharm I got 2 shots in July and August,I also prepaid 2 Moderna shots for October/November but I have no idea if it will be healthy for me.I wrote an email to Paul Ehrlich Institute,they are the german vaccine authority.They replied "Zu Impfungen, bei der ein in der EU zugelassener und ein nicht in der EU zugelassener COVID-19-Impfstoff verabreicht werden, sind keine Aussagen möglich","No statements can be made about vaccinations in which a COVID-19 vaccine is administered that is approved in the EU and one that is not approved in the EU'
This information is from August 10th 2021.
In September I wanted to travel to Germany and get some Covid 19 shots.Since nobody can give me information I will postpone my trip to Germany.I'm also not sure if I can receive my Moderna shots here because nobody can tell me if it is safe.Maybe at some point they will have100% safe information which vaccines you really can mix,but since Sinovac/Sinopharm are not approved in the EU I doubt they will even start to explore the compatibility of those vaccines.I saw Greece and Spain authorized Sinovac/Sinopharm maybe they will explore the compatibility.Until then ...
Now I feel stupid I decided to get the Sinopharm shots it helps maybe to stay hospital free but for travel it sucks