iTunes Match not working

A year ago I moved from a PC to a Mac computer so all my devices (iPhone,iPad,iWatch) could be synced. I downloaded all the music I had on my PC to my Mac. These were approximately 150 CD’s that I own. I signed up and have been paying for iTunes Match since that time but only a few of the albums/songs will play. All the others are greyed out. They all show up on all devices but I can’t play them. How can I enable them. Thank you.