After a recent MCL update, it won't let me play as it thinks I haven't purchased Java despite playing it for the past few months...

Managed to summarise it already above.

I bought Java on the 27th June as a redeemable code, and redeemed it straight away. Signed in with the Minecraft Username Stargaming3. I have been playing Java for the past few months until an MCL update came through today. I updated the MCL and then asked me to sign in. No big deal... so I signed in. after getting to the main page it then only gave me the option to play the demo and told me if I wanted to play, I would need to purchase Java... Which I had done in June... I can assure you that the account I signed in with after the update was the correct account, signed in the same way as I did originally.