Merge my freestanding peacock subscription back to the free Diamond rewards status with Xfinity

Recently I turned on Peacock, and was prompted to subscribe. I have been a Diamond rewards status level member since 2009.

At what point did Peacock become an “add on” channel, and of what I am reading correct, and I am eligible for the free stream due to my Diamo d status, how can I merge the two so I can cancel the stand alone subscription of Peacock I have?