I am moving my mail services from cpanel webmail to Zoho Mail and have successfully verified the domain wallezz.com. I've created email for almost 25 users, but christian.linting@wallezz.com has been placed in the Invitation List and shows up as pending. 

There is a very quick short red message showing up when I try to create that last user but it disappears too fast to be able to read it. 

This is urgent because the  christian.linting@wallezz.co email address is my boss account to receive email and at the moment any email sent to this address comes back as "user unknown"! 

Thank you for your help!