Alexa actionable notifications works in developer console test; not on device

Have done plenty of searching on here. Followed the GitHub examples and also some videos ( of course there’s some variation ).
Had some success. In the alexa developer portal test environment it seems to work correctly. Deployment goes fine ( have my nabu casa url set etc. ). On any device when I do alexa and invocation name it doesn’t seem to recognise it.
Any pointers on where I should look?. Or is this integration no longer supported and is unlikely to work?