I had this working great for years. Tried to “fix” something that was not broken, updated some DH in SmartThings and now the LED notifications are no longer available in WebCore. I used these for pulsing and solid LED colors for various door and lock combinations.
Are you able to add them as available devices in webcore —> ST app > your instance of webcore > settings > available devices > available devices > capability group 1-3?
Just a note… webCoRE will be phased out when groovy is shut down so you may want to start planning to use Routines if possible