How to implement WideVine MediaDRM on Amazon Fire TV - amazon

I am trying to implement the Android WideVine DRM solution on Amazon devices - while using the Amazon Fire TV. I got NotProvisionedException while using WideVine MediaDRM. I downloaded (https://github.com/amzn/exoplayer-amazon-port) the Amazon porting for exo-player and run it on the Fire-TV device it fails to play.
Can you tell how to provision Amazon device for WideVine purposes ?
I see that the Amazon Fire support the WideVine DRM scheme, and the device is level 1 secured. how can i make the Exo-Player demo run on the Amazon Fire TV ?
Thank you for your time,
Yaniv

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