Email Templates (Verification email) - Error configuring Redirect To URL

Hi! How is everyone? Could you please help me with the following issue: when configuring the “Redirect To” input in the Email Verification email template, I get the error shown in the attached image, so I’m unable to save the changes. The URL I want to redirect users to is also configured in “Allowed Callback URLs”, as indicated in the documentation.

Error!
There must be a verified custom domain to perform this operation