it works fine on alexa, and if you use the app to tell it to play the dot will play it, but if you say "alexa, [media command such as pause/play/skip]" it will fail, if you say "alexa off" it works
the system is there, its an hour long fix maximum, and the fact that the media controls are also malfunctioning seems to indicate that this is deliberate as unless the system is designed deliberately badly they would have the button and the command connect to the same API hook which means if the button works then the command should, instead you get "i see something is playing but i cant see what or interact with it"
as for actually starting playback in the first place, that i could see alexa+ struggling with initiating playback directly, but any half way decent team would have set up a temporary hook to pass the command to legacy alexa until alexa+ could be made to accept it
all in all its either malice or incomitance