Edit: Seeing a couple more threads on it, so may need to disregard the below.
Can you log into your account via the website?
https://account.elderscrollsonline.com/
If you're getting the same error it could be someone else has gained access and locked you out. If you've been banned/suspended they normally send an email stating as to why.
If you're having no luck it could be worth using the account recovery option on the support site to raise a ticket with them.
https://help.elderscrollsonline.com/
Thanks, will pass info on. They're normally sleeping at this time so not sure what the response will be from Gina/Jess.Edit: Seeing a couple more threads on it, so may need to disregard the below.
Can you log into your account via the website?
https://account.elderscrollsonline.com/
If you're getting the same error it could be someone else has gained access and locked you out. If you've been banned/suspended they normally send an email stating as to why.
If you're having no luck it could be worth using the account recovery option on the support site to raise a ticket with them.
https://help.elderscrollsonline.com/
account link is down currently and get log in failed on all accounts when trying to make a ticket