If you send an e-mail to email@example.com then they should be able to sort things out. There are many reasons why people lose access, some more technical than others.
To address your post to someone in particular, you need to put @ before their name so that they get notified.
I hope that it all works out.
hello @dai-alun-hughes & thanks for your kind words about how much you’re enjoying learning with us that’s very much appreciated!
I’ve had a quick look at your account, and I can’t see any obvious reason why you would have lost access, so I’m tagging @Kinetic so he can have a look and see what’s going on. We’ll get this sorted for you!