Refresh WAN IP address

I live in Washington DC, where my Sling includes local stations like NBC and Fox.  Network maintenance last week resulted in me having a WAN IP address that appears to be in Richmond, VA, more than 100 miles from Washington and in a TV market that does include the local channels I am paying Sling for.

I researched how to fix this with Sling, and they say only "contact your internet provider".  I need to refresh my WAN IP address to one that the universe believes is in Washington DC suburbs so that I can again get the local channels included in my plan.

I tried the Xfinity AI Assistant to release and renew my WAN IP address, but no luck.  How can I get a new WAN IP address?

Thanks for your time and help.