Hi,
I do not understand your issue.
BeatStep Starts and Stops with the rytm but the sequencer is not running.
So you say that it starts and stops but the sequencer is not running.... So it does not start/stop ? Maybe you say this because you see the Play button lit up..
If your play button is lit up but your position indicator is not running the BSP is not running, it is just paused or prepared to play.
This is maybe because it is set to Clock synchronisation but does not receive clocks. Are you sure your Elektron sends some clocks ? Please check that your MCC Clock settings are matched with Elektron's ones.
Best
Valentin