I'm getting this problem for a flight tomorrow, HAM-LHR (connecting onwards to USA). Checked in fine, but can't obtain the boarding pass, and MMB says "Your passport and/or visa(s) must be checked at the airport".
It's the return leg of a B2B. All API has been entered correctly. I assume they'll be fine to print when I get to LHR tomorrow, but thought I'd check here just in case there's anything I should be worrying about?
Thanks