You can’t omit the double braces for templates {{ }}.
Also check if the trigger.value attribute is even used - trigger.payload should be there in every case, .value only for some DPT and if you submitted your project file. Click the blue “Triggered” bar in the automation builder to see its values live when it fired. See Knx trigger doesn't work - #4 by farmio
And last but not least, when pasting yaml here, please use code tags. See How to help us help you - or How to ask a good question