I get the same thing - just downloaded the latest version of the workflow.
Log shows this -
[12:25:23.781] Logging Started...
[12:25:31.242] iMessage 2FA[Script Filter] Queuing argument ''
[12:25:31.312] iMessage 2FA[Script Filter] Script with argv '' finished
[12:25:31.314] ERROR: iMessage 2FA[Script Filter] Code 127: /Users/MVR/Library/Caches/com.runningwithcrayons.Alfred/Workflow Scripts/E2E72D95-AC79-413C-849E-619AD2A47E78: line 1: php: command not found