Hi, we have a professional account of zoho desk. I created a new ticket for my customer and normally he would receive one email "new ticket is created for you" and then another email "invitation for the zoho self service portal" at the first time. but he can only receive the ticket email, no invitation for the zoho self service portal. I tried to add him to the end user through my zoho account but after my operation he still can not receive any invitation. Could you please help me and check what is the problem? His email address is yihan@xcharge.com. Thanks a lot!