I get this is borderline Fios/Vizio issues... but I recently upgraded to the new Fios TV One boxes, everything is working fine, including using Alexa to change channels, etc. I've read that some folks have been able to turn on and off their TV, but I haven't been able to. I have a 5 year old Vizio smart TV, that has CEC enabled on the TV and TV Input is enabled in the Fios settings. The power button on the remote works, AND I can actually turn on/off the TV using my Google Assistant and Chromecast.
When I ask Alexa to turn on/off the TV... she says something like "that feature/function is not available on your tv-0195 (name of TV)."
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You can't use the FIOS skill to turn the TV off and on.
What you have to do is say something like Alexa, FIOS ON. Or Alexa FIOS Off.
Then the CEC will turn the TV on or Off