I'm traveling to Germany from the UK next week and hope to get the vaccine certificate situation sorted. I downloaded Corona-Warn but it's not recognizing the barcode on my NHS vaccination certificate. (I used the NHS certificate that's valid for travel and am sure I was scanning the QR code for the second dose.) However, I've been able to scan the NHS code and generate a certificate in TousAntiCovid. Will the French app be recognized in and around Frankfurt/Mainz or do I need to carry a paper copy of my NHS certificate or figure out how to download CovPass once I arrive and find a pharmacy to update it?