You don’t normally have to have an Echo device, some people just have the Alexa app, but I’m not sure how custom actions work with the Alexa built into Samsung TVs.
Because I depend on a screen reader, I can’t follow the details of your images, but other people should be able to.
Let’s try this as a troubleshooting step.
TROUBLESHOOTING TEST 1
let’s try something which isn’t a custom action.
So create a new Test routine in the Alexa app (not the smartthings app.)
Use the same virtual contact sensor opening, Alexa Test, as the trigger.
But for the “what happens next,” instead of doing anything with the tv, pick one of your smartthings-controlled lights and turn it on. Just one light, we want to keep this test simple.
Save the routine.
Now if you turn on the associated virtual device in the SmartThings app using its device tile does the test light also come on? If so, we know the virtual sensor is working as a trigger for an Alexa routine, the issue is with the custom command to the television.
If not, ask in the author thread for that virtual device and people there should be able to get it working.
Once it is working, proceed to the next test.
troubleshooting test 2
If the virtual sensor DID work as a trigger in the Alexa routine, we’re ready for the next step.
Now let’s change the test routine in the Alexa app. remove the turn on the light action we used in the previous test and instead add a custom action to turn on the light. It’s the same light, but we’re turning it on in a different way.
So if the light you used in that test was called “table lamp,’ your custom action would be “turn on table lamp.”
Now turn on the Test Alexa device in the SmartThings app just using its device tile.
If the test light comes on, then the issue is probably having the Samsung television give a custom command to itself, so for the next step we may need to get help from someone familiar with the details of these televisions.
If the test light does not come on, custom actions may not work with the Samsung television as the Alexa device, in which case we’ll have to try a different approach.
But let’s start with just those two troubleshooting tests.
First, does your virtual device work as an Alexa trigger for a non custom action?
If it does, then second, does your Alexa routine work for a custom action which is just a light, not a television feature?