Never tabs, always indent with 2 spaces.
Your yaml isn’t readable here unless you wrap it in code tags (tripple backticks a Line before and after ```).
You can edit your post to add these.
There is a lot of documentation about yaml - just search the web for it or stick to the examples from the HA documentation.
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PS - backticks DONOT work. I have never faced this issue - Maybe because we dont use US kbd? I have tried all combinations. We use qwerty UK kbd. Its frustrating - Why use some obscure backtick which cannot be even used by not american keyboards
farmio already pointed this out 2 times, but still its in your code
There is no address in knx_event, its destination
So there is no valid event and the trigger will never “trigger” thus no action.
Thats what you should use. With version changes old threads will become invalid.
As for the trigger itself: in the automation you cann see if a trigger is being activated.
If you send an 1 to the knx group 7/6/1 does it show as triggered on the automation?
And in the developer tools, what was the exact trigger you saw?