NBA League Pass Detecting Proxy - No VPN INstalled

I subscribe to NBA league pass, which doesn't allow the use of proxies or VPNs due to its geolocation requirements. The app is consistently blocking access to content becasue it claims there is a proxy on my network even though I do not have a proxy or vpn active; it works on data and other wifi networks, just not my xfinity wifi. What causes this, and is there a solution?