Domain is receiving the message "Please enter a valid domain"

Hello,

I’m trying to add an existing domain, “flavors-pr.com” but I get the message “Please enter a valid domain”. why would this be happening? is it because of the hyphen? this site was live in a WordPress site recently.


Here is my site Read-Only: LINK
(how to share your site Read-Only link)

^Bump - I am experiencing the same issue.