I just fulfilled the PLF and put me and my wife to it. The question is that the system asked me only for my vaccination certificate and not also for my wife's certificate. I am vaccinated with AstraZeneca and my wife with Phizer, both vaccinated twice. There is an instruction that in the case of family the PLF should be submitted per family and two different PLFs, for each one.
I ask for help if I did it correctly.