unable to change channels with samsung tv smart remote

 ... i want to use the universal samsung remote to control the xfinity box, but it is not working. ...

If the remote is a universal remote, https://www.samsung.com/us/support/answer/ANS00050204/ may help.

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Hi @user_a5e5b4,

 

Thank you for showing interested in using a third-party universal remote for controlling our Xfinity TV set-top boxes including X1 and Flex. Our devices do support the use of third-party universal remotes, but we would not provide any support outside the remotes that we include with our set-top boxes.

 

We recommend visiting the link that @BruceW provided as well as reaching out to your television and/or remote manufacturer for features and support for their devices. We also recommend visiting our Universal Remote Support on Xfinity X1 and Flex TV Boxes support page as well.

 

We do provide our Xfinity Stream application on supported devices as well, so you can look into that option as well and see supported devices by visiting our Xfinity Stream App on Xfinity TV Partner Devices FAQs support page that can answer many questions on the benefits and features of using our Xfinity Stream application.