Hi,
I hope this is the correct place to post, I haven't found a similar thread.
I am flying with BA on Tuesday 29/03 and I can't submit the pre-travel COVID information.
I tried on 2 different computers and 2 different systems and every time I click Submit, the button is greyed out and ... nothing happens. (Just to clarify the button is active once I upload the attachment, but goes grey upon clicking, nothing happens, no errors, the page does not reload.)

I had previously used this system successfully so I don't really know what's going in.
Do I have to call BA tomorrow, or should I go to the airport without checking in (I cannot complete check-in without this)?