I am not an expert but I would have a look at https://internet.xfinity.com/network/advanced-settings/portforwarding. As a second step you could try the following 10 easy steps:
Open the Xfinity app and sign in with your Xfinity ID and password.
Go to the Connect tab.
Select your network.
Select Advanced Settings under More.
Select Port Forwarding from the menu.
Select Port Forwarding.
Choose the household device for the port forward you are setting up from the drop-down list of connected devices.

    Note: If you don't see the device listed, it may be because the device is not connected to your home network, it’s using an IPv6 address, or has a static IP set in the Gateway Admin Page.

Choose from the list of common applications to use a recommended, preset configuration (e.g., Xbox or PlayStation) or select Manual Setup to enter specific port numbers, ranges and/or protocols.

    Note: If you're unsure what port settings to choose, reference the device manual or the application you're trying to use. Opening unnecessary ports isn't recommended, as it poses a security risk.

Select Apply Changes to complete the setup of the port forward.
The device you set up for this port forward can now use these settings.
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