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 Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
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