@dan5150, wonder if you might have multiple TRIGGERcmd accounts, and your Alexa account is tied to the other TRIGGERcmd account?
Just brainstorming here.
If so, you could try unlinking and re-linking to your account.
EDIT: We figured it out - Dan had "shut down /s /t 30" as his command but he needed "shutdown /s /t 30". Notice the shutdown command shouldn't have a space it in. There's a shut down command in the Example commands BTW.