Hi,
If you cannot log in to cPanel on both your reseller account and customer accounts, but the associated websites are functioning normally, there are several possible reasons for the issue. One common cause could be that your IP address is blocked. You can check your public IP address by visiting this link. Once you have your IP, you can open a support ticket with TCH to verify whether the firewall blocks it. Additionally, you need to double-check your login credentials to ensure there are no typos or errors.