No telegrams for WT in MFS queue

I've setup a simple MFS  in SAP EWM(9.1). My WT is put in the correct MFS queue (without resource management) but it is not automatically processed.

I'm using FM "/scwm/mfs_sim_receive"  to test the telegram communication. The WT is assigned to the correct queue but no telegram is sent /created

I've checked with SMQ2 whether there is an error as suggested  in here. but there is none.

Below the WT log when manually confirming on the first communication point.

Any suggestions would be much appreciated