Custom Playing Techniques and assigning them to Expression Maps

Installing the Dorico 2 Pro, I. went to check the new ability to create custom Playing Techniques, as it is lacking some for tuned percussion.

I want a section to be played with tremolos, so I created a tremolo Playing Technique. I cancelled it with the ord Playing Technique.

When configuring the Expression Maps, I need to activate a Key Switch event. With the normal tremolos, prom the Repeat Structures menu, I have the VST playing accordingly. But strangely, with the created playing technique I can’t have it playing correctly.

What am I doing wrong?

Edit: Problems with attachments.