MS Azure :Text To Speech API

Regarding node-red-contrib-cognitive-services,
Has anyone ever run the Text To Speech API node?

I tried to put the connection ID of azure's speech api in this node and tried, but for some reason a connection error occurs.

I'm looking at this at the moment, and so far not getting much luck.
Using the free tier doesn't seem to support Issuing Tokens in the debug message is to be believed, so not sure how they expect you to interact with the API...

Will report back if i get this going.