When I try to add a user to the Customer list of a service desk project the user is showing but when I navigate to a other page and go back no customer is showing in the customer list.
Customer users are showing in Jira User management -> Jira Service desk but are not showing in the Customer list of a project and I cannot add them to Customer organization because of that.
Update: It turned out to be an issue in Jira service desk service which was resolved.
