We have Contacts in Desk synched with CRM. When we send a Contact an invitation to the Support Portal, they are able to change their name, email, phone, & timezone. Unfortunately, they are changing their name and email to groups or distribution lists, providing support to unauthorized users, and making it difficult for us to provide support because the Contact has been changed. Then we have to get in an argument with them why they can't change their contact info to other people. It would be really helpful if we could prevent them from changing their name and email address when they log into the Help Center.