The following error will be seen as well as the Role Change showing as NULL:
Operation failed while changing User Role
DomainID value is Null in the EmailAcct table for the account.
Open a Support case with Arctera to update the DomainID value in the backend.
Operation failed while changing User Role is seen when trying to change a User Role or assign accounts to a reviewer in Arctera Management Console.
JIRA: EVCSRE-6165