I'm flying from YYZ to BCN via FRA next week and understand that current regulations do not require anything from Canadians transiting through Germany to Spain (where Canadians are not required to provide any testing or vaccine records; I am fully vaxxed FWIW).

However, I've seen some FT stories where misinformed airline / airport staff are still asking people in my situation to provide proof of the Digital Entry Registration. Wanting to be safe rather than sorry, I tried filling one out, but once you enter Canada as your origination country, it just says:

Any advice on what I should do to avoid any issues? Thank you!