Hello,
I've been lurking around over the years, learnt a lot and managed to read many good tips about ex-EU, upgrades and finding the best fares but this is the first time I've got a genuine question.

I'm booked on BA2707 ACE -> LGW tomorrow Sun 28 Apr in Club Europe
At 20.05 today (10 minutes after online check in opened at 19.55) I tried to OLCI and got the message "We're unable to offer you online check-in. Please check in at the airport".
I'm a lowly Blue (this trip is a BA Holiday with car, combined with a few others I'll get back up to at least Silver shortly)
Will be travelling HBO. I didn't pre-pay for a seat.

I'm just a little worried I might get bumped,
I don't have Expertflyer, but tried to make a dummy booking for tomorrow and BA is selling Club Europe (C class) so it doesn't look overtly full.
(I learnt my homework after reading other similar posts here)

Anyone having the same problem? Or maybe it's just a BA IT glitch?

Thank you in advance