Unable to save an automation using Toggle Sensor – Android, Multiple Bridges upgrade

Hello,

I’m using Hue Essentials on an Android phone. I’ve recently purchased the Multiple Bridges and automation upgrades.

My aim is to use an Alexa voice command to enable or disable a Philips Hue motion sensor in my Media Room.

I’ve already created a SmartThings virtual switch called Motion Sensor Control, which is visible as a device in Alexa.

I’m having a problem creating the required Hue Essentials automation.

What I’ve tested:
I create a new automation and select Add Event → External.

I add an action to Toggle Sensor and select my Media Room sensor.
When I try to save the automation, Hue Essentials refuses to save it.

To investigate, I created a separate test automation using the same External event, with an action to switch on a light group and set its brightness to 50%.

This automation saved successfully, appeared in my list of available automations, and ran correctly.

However, an automation using Toggle Sensor will not save.
Could you please advise whether this is a known bug or whether there is a workaround?

Is Toggle Sensor currently supported as an action in an External automation?

Ultimately, I would also appreciate advice on whether an Alexa voice command can trigger this automation, directly or through SmartThings, so that I can enable and disable the Media Room sensor by voice.

Thank you for your help.

DeL B