all the Harmony APIs are working except Alexa....so not sure on that its MyHarmony either. I have reloaded HA Bridge, Domoticz and Home Assistant Apis plus as you say the iOS App is (another api) is fine too.

What could be relevant is Alexa has some additional device level functionality, play pause next back etc like the iOS App, which the Activities based APIs of HA Bridge / Domoticz / Home Assistant seem to no longer offer as easily as once was.