We’ve most likely detected some sort of suspicious activity that has occurred on your account.
As a result, our automated anti-cheat system has banned your account to limit further access to it while we investigate the situation. Please note that we do take security very seriously, and we want to proactively limit the damage and the number of users that could be affected as a result.
We can’t get into much details in here, due to the confidentiality and safety of our users.
Should you need any further information, please do not hesitate to contact us at firstname.lastname@example.org