Can't add resources to Help Desk Queue

Summary:

When trying to add an employee to a help desk queue, they do not appear within the search results.

Trying to understand if there is some type of restriction or set up in the queue that is preventing me from adding the employee.

Content (required):

Next Gen Help Desk

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):