After installing Xfinity Stream on Amazon Firestick it not letting me log in.

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@Chaney0534 wrote:

After installing Xfinity stream on Amazon Firestick,  I try to log into Xfinity and I get an error message stating I’m already logged in and it states I have invalid username and password. But both Username and password I entered are correct.  How do you resolve this issue.

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firesticks are not authorized devices for the xfinity stream tv app. (nor is a cube)

For reference: Xfinity Stream App Minimum System Requirements.