Not receiving my plans (1200/200) stated upload speeds of 200 Mbps - Currently capped at 40 Mbps!

Hello. I currently have 2 locations on my Xfinity account in Illinois (Chicago area). At location #1 I have 1200/200 internet, with speeds exceeding those numbers. At location #2 I also have 1200/200 internet, with download speeds exceeding 1200. However, my upload speeds are capped (throttled) at 40. Between September 22, 2023 and November 15, 2023 my upload speeds at location #2 were averaging 240 Mbps. Since November 15, 2023 however upload speeds at location #2 have been capped at 40 Mbps. After numerous calls to Xfinity Tech Support over several months, I was told to update my modem from XB7 to XB8 to no avail, and numerous tests were run, my modem reprovisioned, and a tech visit yielded no issues, but still to this day my uploads max out at 40 Mbps. Please, will someone explain what is going on? Thank you. 

P.S. I have also sent this message in a direct message to Xfinity Support, along with my contact info.