Forgot, also you have to follow this KB to "fix" your master computers iTunes library so it has the correct info. Then you do the rest.
If your music library shows incorrect details with iTunes Match or Apple Music, and you previously cancelled an iTunes M…
Got mine working with this tactic. Basically account settings should have a "reset" option for the cloud, essentially deleting what you have in the cloud. Since I lacked that option, I merely went to my other computer and opened up iTunes there. I deleted all music from that iTunes instance so the library was empty. Then I turned on iCloud library, of course it pulled down everything (the screwed up stuff) from the cloud. Once this was done I deleted everything again, so that the library was empty. Then waited for all of that to go to the cloud.
Then i went to one of my iOS devices and turned on iCloud music on there to confirm nothing shows up, no new playlists nada... success now that cloud has "nothing".
Then turned off iCloud music on everything again.
Went back to my original computer with the proper library with all my music rating etc, and turned on iCloud music. This then analyzed my library and put everything in the cloud for me again. Then when i turned on iCloud music on my iOS devices, they got the proper stuff from the cloud and all is well again.
Of course make a backup if at all possible of your iTunes library cuz you never know. And if you don't have a 2nd computer like I did you can just make a new account on your computer and have iTunes sign in with your normal PW etc. Then you should be fine.