Adding verification code to domain setting (to change role from member to co-admin)

Hi Box,

When I try to change a user from member to co-admin, I get an error message stating "Admin and Co-admin roles must use a verified domain for the primary and secondary email addresses".

Our company uses GoDaddy for web hosting and Cloudflare for DNS. I cannot figure out how to add the verification code to our domain setting; help would be appreciated.