As an Agent, I am unable to re-assign the request to myself or another resource in HR Help Desk

Hi All,

There is an issue we are facing where, I login as an Agent and I see the request assigned to me. But when I try to assign the request to another person in the same queue, the 'Assigned to' field doesn't bring up the resource name. It doesn't even bring my name up after I clear the Assigned to field. Could you please let me know what could be the reason?