Are those other agents also assigned to the Service Desk Team role of the Service desk project where you are trying to assign them?
If that's not the case, that could be the answer to your problem. If they are, have a look at the permission scheme of your Service Desk project. The Service Desk Team role should be granted the assignable user permission.
Hey Atlassian community, I help lead engineering at Sentry, an open-source error-tracking and monitoring tool that integrates with Jira. We started using Jira Software Cloud internally last year, a...
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