If we ask Alexa turn on /off the light it will respond Okay or device is not responding can we change customise the response as we need.
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Unfortunately, this isn't supported right now. I'd suggest posting this as a feature request in our ideas space here.
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Sending ChangeReport - does my server contact endpoint directly? Or a skill?
Finding a Smart Home Device
What capability interface to implement a stove with multiple burners?
How to get the Smart Home API Skill to respond with my custom words and phrases?
No Devices found after discovery