Originally Posted by
marks88
For whatever reason, United did not let me check-in online/via app for any ex-US flights to Europe. They always wanted to check the docs in-person prior to departure before issuing boarding passes. Not so ex-LHR/EU - could get them in App. So even if you resolve the passport thing, I am not sure you will get your boarding passes anyway.
It's been like this for several months. It worked great earlier in the year. Luckily airport checkin has improved from the huge mess it was a few months back.
There also doesn't seem to be an issue returning to the US though I had to upload via the website because the phone would not allow me to upload BOTH vaccine and test.