What new restrictions are making Celtics and Bruins games suddenly unavailable?

I am a single mother of three boys who are all huge Boston sports fans. We have not missed a Celtics game all season. Suddenly I’m getting a message that I don’t have access to watch Celtics OR Bruins games?? Please explain. My ex-husband uses Verizon and he can still get the games so my kids are watching it through his account on their phones. I cannot pay this much for cable and not be able to watch sports games with my boys,. Please provide more information because I will not be able to continue working with xfinity if I can’t get the games. Please help.