Hey @user_8s5mcs,

Thank you for visiting our official Xfinity Forums Community support page. We have reviewed your post as well as other comments on some other users post. The ARRIS SURFboard SB8200 DOCSIS 3.1 Cable Modem is working as intended. The device is not supported on our Next Generation Internet speed tiers, so the device is not eligible for the increased upload speeds.

If your account is in a Next Generation Internet speed tier location, I highly recommend visiting our "All Compatible Devices (Including Next Generation Speed Tiers)" support page where you can find a list of all currently supported Next Generation Internet speed tier cable modem models. All supported models will be listed under the "Next Gen Speed Tier" section.

The ARRIS SURFboard SB8200 DOCSIS 3.1 Cable Modem may or may not be added in the future. It will have to go through a lot of testing and certification before being approved to receive the Next Generation Internet speed tier list. 

@user_8s5mcs 

The chart is at the top. These are the only devices that currently support the "Next Gen" speed tier.

The employee pointed you to that page. Comcast could have made things much more clear but they have chosen not to... Google can help fill in the gaps somewhat: https://www.google.com/search?q=xfinity+next+gen+speed+tier 

Hey guy. I'm trying to help you..... Don't kill the messenger... I'm not a CC employee.

You're quite welcome ! Understood. No worries ! Good luck to you !