In my JIRA Service Desk, I have create a single select custom field, which I set the filter as all active users. And
But when I login my customer account in customer portal, no users in this field for me to select.


Checked that if I login my admin account. I CAN use this field normally.
Could you please kindly help how can I set a customer account can select users in this field ?
Where should I set the user permission?