Now TV and ESPN

I can no longer watch programs on ESPN via Now TV. The system was working fine up until June 2024. I now receive the following message: Valid Token Required when trying to watch a specific program. I have not changed anything on my end, so it seems that there is an authentication error is happening through Xfinity Now TV. Please resolve this issue or tell me what I need to do on my end so that I can view programs that I prefer.