GetRepresentative does not return required AOR

Summary:

There are two representatives with the AOR type '****_REP'

First AOR's user name: mary@test.com

Second AOR's user name: john@test.com

Adding the below condition in an approval rule:
Task.payload.Requestor's Assignment.result.username == GetRepresentative("****_REP",Task.payload.Worker's Current Representative.result)]

Requestor is john@test.com

GetRepresentative is always returning only 'mary@test.com'

—————————-Is it possible to retrun all representatives to use a in condition something like:

Task.payload.Requestor's Assignment.result.username IN (dynamic function to fetch all matching AOR's)

using GetAllRepresentatives function ends in error

Content (please ensure you mask any confidential information):