Here is the flow code for the picture I posted, one thing to note is you may have to change the wake word you strip out, which in my experience is altogether unnecessary since out of the device activity output message, specifically the summary, which contains what was said, does not contain the wake word, but that is what the guide said so whatever. Also, the configuration nodes will have to be switched to yours obviously:
[{"id":"68ba5945.906288","type":"tab","label":"Generic Light Control","disabled":false,"info":"Turns lights on and off per the room you are in."},{"id":"80bb010d.082ce","type":"switch","z":"68ba5945.906288","name":"Phrase Handler","property":"payload.description.summary","propertyType":"msg","rules":[{"t":"regex","v":"turn off ( the)?lights","vt":"str","case":false},{"t":"regex","v":"turn on ( the)?lights","vt":"str","case":false}],"checkall":"false","repair":false,"outputs":2,"x":520,"y":320,"wires":[["af996470.7bf118"],["e0acbb82.c84ac8"]],"outputLabels":["Turn on",""]},{"id":"1737ebff.565734","type":"hubitat command","z":"68ba5945.906288","name":"GR - Lights Off","server":"b130c189.ea4d2","deviceId":"67","command":"off","commandArgs":"","x":720,"y":120,"wires":[[]]},{"id":"af996470.7bf118","type":"switch","z":"68ba5945.906288","name":"Device Handler","property":"payload.deviceSerialNumber","propertyType":"msg","rules":[{"t":"eq","v":"G090U509912423CC","vt":"str"},{"t":"eq","v":"G6G0XG100134018V","vt":"str"},{"t":"eq","v":"G090U5099117264T","vt":"str"},{"t":"eq","v":"G090U509911620T7","vt":"str"}],"checkall":"false","repair":false,"outputs":4,"x":520,"y":180,"wires":[["1737ebff.565734"],["6f6ae5ea.792f9c"],["c73b5d38.e4ed6"],["83b32c58.41ce"]],"outputLabels":["Great Room","Downstairs Bedroom","Kitchen","Master Bedroom"],"info":"Great Room - G090U509912423CC\nDownstairs Bedroom - G6G0XG100134018V\nKitchen - G090U5099117264T\nMaster Bedroom - G090U509911620T7"},{"id":"3407811a.1e9e4e","type":"change","z":"68ba5945.906288","name":"Summary Handler","rules":[{"t":"change","p":"payload.description.summary","pt":"msg","from":"^(echo )?","fromt":"re","to":"","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":330,"y":320,"wires":[["80bb010d.082ce"]],"info":"Strips the wake word from the summary (May not be needed anymore)"},{"id":"6f6ae5ea.792f9c","type":"hubitat command","z":"68ba5945.906288","name":"DB - Lights Off","server":"b130c189.ea4d2","deviceId":"69","command":"off","commandArgs":"","x":720,"y":160,"wires":[[]]},{"id":"c73b5d38.e4ed6","type":"hubitat command","z":"68ba5945.906288","name":"K - Lights Off","server":"b130c189.ea4d2","deviceId":"68","command":"off","commandArgs":"","x":710,"y":200,"wires":[[]]},{"id":"83b32c58.41ce","type":"hubitat command","z":"68ba5945.906288","name":"MB - Lights Off","server":"b130c189.ea4d2","deviceId":"501","command":"off","commandArgs":"","x":720,"y":240,"wires":[[]]},{"id":"666629d2.9fdf18","type":"hubitat command","z":"68ba5945.906288","name":"DB - Lights On","server":"b130c189.ea4d2","deviceId":"69","command":"on","commandArgs":"","x":720,"y":440,"wires":[[]]},{"id":"a4468c2.dde517","type":"hubitat command","z":"68ba5945.906288","name":"K - Lights On","server":"b130c189.ea4d2","deviceId":"68","command":"on","commandArgs":"","x":710,"y":480,"wires":[[]]},{"id":"5b9d4c70.22d984","type":"hubitat command","z":"68ba5945.906288","name":"MB - Lights On","server":"b130c189.ea4d2","deviceId":"501","command":"on","commandArgs":"","x":720,"y":520,"wires":[[]]},{"id":"f5561f49.28d01","type":"alexa-remote-event","z":"68ba5945.906288","name":"","account":"4553eef5.ffc05","event":"ws-device-activity","x":130,"y":320,"wires":[["3407811a.1e9e4e"]]},{"id":"cd66091.af90cf8","type":"hubitat command","z":"68ba5945.906288","name":"GR - Lights On","server":"b130c189.ea4d2","deviceId":"67","command":"on","commandArgs":"","x":720,"y":400,"wires":[[]]},{"id":"e0acbb82.c84ac8","type":"switch","z":"68ba5945.906288","name":"Device Handler","property":"payload.deviceSerialNumber","propertyType":"msg","rules":[{"t":"eq","v":"G090U509912423CC","vt":"str"},{"t":"eq","v":"G6G0XG100134018V","vt":"str"},{"t":"eq","v":"G090U5099117264T","vt":"str"},{"t":"eq","v":"G090U509911620T7","vt":"str"}],"checkall":"false","repair":false,"outputs":4,"x":520,"y":460,"wires":[["cd66091.af90cf8"],["666629d2.9fdf18"],["a4468c2.dde517"],["5b9d4c70.22d984"]],"outputLabels":["Great Room","Downstairs Bedroom","Kitchen","Master Bedroom"],"info":"Great Room - G090U509912423CC\nDownstairs Bedroom - G6G0XG100134018V\nKitchen - G090U5099117264T\nMaster Bedroom - G090U509911620T7"},{"id":"b130c189.ea4d2","type":"hubitat config","z":"","name":"Beach House Hubitat Config","usetls":false,"host":"192.168.2.240","port":"80","appId":"801","nodeRedServer":"http://192.168.2.253:1880","webhookPath":"/hubitat/webhook","autoRefresh":true,"useWebsocket":false},{"id":"4553eef5.ffc05","type":"alexa-remote-account","z":"","name":"","authMethod":"proxy","proxyOwnIp":"192.168.2.253","proxyPort":"3456","cookieFile":"authFile","refreshInterval":"3","alexaServiceHost":"pitangui.amazon.com","amazonPage":"amazon.com","acceptLanguage":"en-US","userAgent":"","useWsMqtt":"on","autoInit":"on"}]