I have looked through everywhere in the community who might have a similar issue like mine but I can't find anything at all.
My customers have registered into my project with a method that my admin team add their Atlassian account into our domain as "Jira Service Management - Customer"
and not a portal-only customer like my second account which I was able to change my name on that account.
When my customer tries to go into account and change their names, they were unable to edit their name and there was a message saying "This field is managed by an administrator" instead.
I'm not sure how they will be able to change their names, is it because they lack sufficient permission? If so what app permission that they should have to be able to change their names?