Re-entering the US via BA with Verifly was a breeze. However, because my French EUDCC placed my surname before my given name, Verifly rejected it for my outbound flights to Portugal. BA staff at the SEA lounge handled everything for me instead - didn't miss it at all. Where Verifly came in very handy was when it clarified the need for hard copies of some documents for my return to the US via LHR. Reportedly BA didn't drive home this requirement on its site, because many people trying to check in ahead of me were turned away and told to find a printer