VeriFlop indeed.
For trip to BCN, Verifly couldn't handle middle name and was unable to verify either my Swiss or CA digital vaccination cert. Manual verification finally worked and I was able to check-in after validating Spanish Health cert. VeriFlop was totally unable to verify GF's vaccination status, however, first due to the same middle name issue and then manual verification failed because Verifly cs claimed her name wasn't clear on the uploaded image of her digital Swiss certificate (utter nonsense, as it's printed in huge block type).
None of this mattered at all because check-in agent at SFO insisted on seeing all documents, including paper vax certs, despite fact I was already fully verified and checked-in with BPs.
Utterly worthless exercise.