It means your account got suspended/banned.
I won't say much as there are many reasons why your account can get banned but for your case, since you mentioned you never used Clickbank before, your suspension might be due to leaving your account dormant without getting a sale for a long time, if not, their system has caught you for being in their non-whitelisted countries.
If your issue is the former, you can simply submit a ticket to Clickbank to get your account reinstated.
But if your issue is the latter (you're from a non-whitelisted country which they don't allow) then you'll have a problem as there's zero chance they will reinstate your account. If so, your only remedy to this problem is to use a VPN or something to create a new account.