Stream app on Amazon Fire TV, Stick, and Tablet devices

https://www.xfinity.com/support/articles/xfinity-tv-app-requirements says, in order to run the current version of Xfinity's Stream app:

• ... your Amazon Fire TV and tablet devices must be running Fire OS 6 or later. 
• Any smartphone, tablet or Fire TV device running Android 6, Fire OS 5 or earlier isn't supported.

Some Fire OS devices may not be capable of running Fire OS 6 or higher and so won't meet the requirements of the latest Stream app. For the latest Fire OS version supported by your device see

https://www.amazon.com/gp/help/customer/display.html?nodeId=G2JXLC4L34GX73TE for tablets, and

https://www.amazon.com/gp/help/customer/display.html?nodeId=201497590 for TV devices.

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