[aur-general] unable to complete registration on aur

I signed up for an account today on aur, and after I clicked the link in my email. I believed the username was correct and it said it wasn't. So next I tried the email copy and pasted it from the email I received. The website kept telling me either invalid email or username. I tried typing them. Copying and pasting them to no avail. Where do I go to next? Sent with [ProtonMail](https://protonmail.com) Secure Email.