I was facing the same problem, but solved while writing this:
If I use the old skill and say "ask trigger CMD to run terço" it works perfect, also works from pressing "trigger" in the website.
If I use the new skill and say "turn on terço" it doesn't.
What have I tried:
Disabling and enabling the skills.
Deleting and adding the command again.
Removing and discovering the comands again in Alexa.
Removing and re-installing the triggercmdagent.
Changing voice command.
Useful info:
Only happens to that command, all the other works fine.
This command is a bash script that open a few chrome pages depending on week day.
I'm using Linux (PopOS 20.04).
I'm using it in portuguese.
Then I decide to try changing the Trigger name. I used "batata" (potato in portuguese) and it worked, then I tried "Terço" again and it didn't, then I tried "Terco", it worked. Apparently it is a problem with "ç" in the trigger name (in the voice command is working well). Since english don't have that, it's understandable. It's not a big thing or really a problem, just wanted to inform so if anyone is having the same problem, try that.