Q: iTunes Match option "greyed out"

Hi Southern Steeler,

To access iTunes Match, you just need to turn on iCloud Music Library. With the addition to Apple Music, they use iCloud Music Library so you can see your media on all devices. The difference is that with iTunes Match, you get all your songs without DRM associated with them. 

Take a look at the articles below to go over these differences to clear this up for you.

Use iTunes Match on your iPhone, iPad, iPod touch, or your computer
https://support.apple.com/en-us/HT204439

iCloud Music Library: Understanding differences between Apple Music and iTunes Match
https://support.apple.com/en-us/HT204962​

Have a good day!