For anyone trying to use TriggerCMD to run a routine on an iPhone, you can do so using TriggerCMD, IFTTT, and iOS Shortcuts. Here is how I achieved it:

• Create a TriggerCMD command of your choosing. It need not do anything.
• Use that command as the "Specific Command" trigger in IFTTT
• For the THEN THAT, I chose "Send me an SMS"*
• In the message of the SMS type a keyword of your choosing. Create the Action.
• On the iPhone, go to Shortcuts, and select Automation
• Tap + to start Shortcut creation. Choose "Message"
• Under "Message Contains," type in the keyword you used in the IFTTT applet
• Finish the Shortcut routine you wish to run when the SMS message is received

*You could also achieve this sending yourself an email through IFTTT and choosing Email in the Automation section of Shortcuts

Using this method, I do not have to say anything to the phone or even be near it to run a shortcut on it.