Alexa-smart-home-v3 and multimedia channel interface not working

Using latest version of node-red-contrib-alexa-smart-home (0.4.67):

I defined a "Multimedia node " with "channel" interface for my tv at

Now when I say "ok google, turn tv to channel 20"
Google Assistant replies "OK, playing 20 on tv"..."Sorry could not reach Node RED Smart Home Control"

In the mean time, at node-red, the alexa-smart-home-v3 node outputs: "Google Assistant command unsupported!"

So Node RED Smart Home Control IS reachable, but it does not seem to respond to Google.

Known problem ?
Any solution ?

Any other solution to get "channel" working for tv ?

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