Hi all, thanks in advance for the help.
I have a return booking LHR PEK, the outgoing leg is tomorrow at 4:25pm, however I have not been able to check in. MMB says "not available" see pic below.
I have called the helpline and the they weren't sure either, but said the flight is definitely running tomorrow. For information, outbound is in WT and inbound is CE (upgraded using avios).

Anyone has any ideas whats happening?
Thanks again