I found an issue, the feature code number for pickup group is not generated, however, you may use the default pickup group number (*8).
For direct pickup you may use *07 + the extension number.
About the call declined message, I have a Yealink desktop phone that shows me the same error, this is something regarding the phone configuration because when I made the dial for pickup the call from an X-Lite softphone, all works as expected.
