Same problem here, already started a new topic before I saw this topic.
Today is Jan. 2nd 2019 and before today both my Wyze cameras worked fine using Alexa with my Echo Show and also on my TVs using a Fire stick, now today it’s not working on any of those but only showing a live feed on my android phone. I have a non-Wyze camera that is still working fine with Alexa thru both my Echo Show and TVs with a Fire stick.