I am unable to create an Alias(super admin ac) under a name that has been earlier used as a group email . I am getting the error message "  xyz@domain.com cannot be aliased to user account, it can only be added to group." . I have already deleted the group.

My Second problem is related to an auto created alias id :  random.number@NewlyVerifiedDomain.com . I suppose this random id comes from when i deleted xyz@OldSubDomain.com , so xyz@OldSubDomain was assigned to  random.number@NewlyVerifiedDomain.com . I want to delete this alias but there is no option to delete it . Since i have already enabled subdomain stripping so there is no need for me to keep this .