Try a different email to validate as mentioned in this guide
I'm unable to log on to characters above Level 20.
- Add [edit: email address removed] to your safe-senders list.
- If you're trying to send a validation email to the address that's already on your account, the system will not send it. You can temporarily use a different email address, validate it, and then change back to your original one.
- Log on to the Basic Information page using the same Display Name you use on the Launcher, check the existing email address, and use a different one. If you're using Gmail, you can use either googlemail.com or gmail.com as the same address, or you can add/remove dots: https://support.google.com/mail/answer/7436150?hl=en