Hey guys,
we made a custom field with the type User picker (Single select)
An jira-administrator can pick an user from the list:

A normal user can't do that.

I googled a bit and someone said, that it's because of those global permissions:

I added there the group from the . (it's an imported Active Directory group)
And it still does not work, I can't pick from this field an user.
Is there anything else to consider to make that work for all users?
Thank you!
Best regards