Looking to get help with coaxial port

The modem is a new Gateway model XB8. Last time I tried setting up the connection, the Xfinity app itself said that the connection was only 50 mbps instead of the intended 1000 mbps, and restarting didn't fix it. I'm not really inclined to try moving my router to that port again since the setup either fails or gives a bad connection as mentioned. I just want to schedule an appointment so someone can look at it.

I am connecting the router directly to the coax outlet, and using the internet wirelessly.

Thank you @user_kcbbxl, If you could send our team a direct message with your full name, the name listed on the account (if different), and the service address associated with your account, I'd be more than happy to look into this for you.

 To send a Direct Message, please click on the “Direct Message” icon in the top-right corner of the screen, next to the bell icon, click the "New message" (pencil and paper) icon, then type or select "Xfinity Support". Type your message in the text area near the bottom of the window and press Enter to send your message and initiate a live session.