Amazon Echo and Honeywell Vista 20P

Hi all -
Looking for some trouble shooting help. I have a Vista 20P connected to Vera through the Honeywell app.
I’ve created a scene that arms my alarm - and this works perfectly fine.

When I go to the Amazon Alexa integration site, I see my new scene in the list of usable scenes. I’ve named this scene for Alexa purposes “Night Stay Arm”

When I tell Alexa to 'Turn on Night Stay Arm, Alexa acknowledges the command and says ok. Then about 1 second later my alarm panel makes a single chime but does not arm. But it does not arm, and it does not show that the scene has run on the Vera.
Any ideas?