No call center user is maintained for agent &1

What causes this issue?

When agent groups are downloaded, it is not the SAP user name but
rather the call center user name maintained in the
<DS:TRAN.SPHA>SAPphone administration user settings</> that is
downloaded. If no call center user is maintained for an agent, the
agent cannot be downloaded.

System Response

The agent group is not downloaded, which means that the whole scenario
cannot be downloaded.

How to fix this error?

Maintain a call center user name for agent &V1&.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.