Using CreateApiAccessToken post processor should create a new access_token when the user in private.conf is changed

Current Situation

When the monitor

<monitor name="process0" ordering="0">
    <script language="java" java_class="com.sos.jitl.restclient.CreateApiAccessToken"/>
  </monitor>

is used in a job the access token is provided in the spooler.variable <user>_X-Access-Tokken and can be accessed with spooler.variables.value("myuser_X-Access-Token") where myuser is the user name from the login.

This works when using a credential store.
When using the private.conf file the myuser always is empty and the access is spooler.variables.value("_X-Access-Token")

Desired Behavior

When the monitor

<monitor name="process0" ordering="0">
    <script language="java" java_class="com.sos.jitl.restclient.CreateApiAccessToken"/>
  </monitor>

the access token should be available in the spooler variable <user>_X-Access-Token when using a credential store and when using the private.conf file.