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Creating an optional inputs to inform teammates



I want to be able to inform my teammate that I need their input by posting a message on Teams, I want it to be multi-select and optional at the same time.

Below is a screenshot.

Screen Shot 2021-05-03 at 4.56.31 PM.png

Screen Shot 2021-05-03 at 4.57.10 PM.png

 Here's my code for "Participants": 

As you can see below, it appears error message saying "The result must be a valid array."
I use the same code for "Link", which is also optional and it works, but I use on "Participants" with multi-select and optional and it doesn't work.
Any thoughts?
Screen Shot 2021-05-03 at 4.58.21 PM.png

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