There is a permission within the permission scheme for resolving issues.
Make sure they are assigned to a role granted that permission in ther permission scheme used by the projec.t
Just to add on, you can use the JIRA Admin Helper tool to quick check the user's permission on specific issue/project. Refer to the following page:
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG