You are not authorized for the external debugging of user &1

What causes this issue?

You are not authorized for the external debugging of user &1.

System Response

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

How to fix this error?

You require the following authorization to debug an external session:
Authorization Object: 'S_DEVELOP'
Object Type: 'DEBUG'
Object Name: <user name>.
Activity: 90 (Copy)

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.