iTunes Match menu item greyed out
I noticed yesterday that only about 10% of my iTunes match songs are appearing on my iTunes installation (on Windows 10).
If I look at my iPhone or iPad, all of my songs are on there.
When I click on the menu on the top left, then choose songs, choose iTunes Store, the sub-menu has iTunes Match, but it is greyed out.
I've tried logging out/in, and also re-installing iTunes (with the latest version).
When I view my music library, I'm showing the 'Kind' column, and the only items that are shown are my purchased items, not the usual 'Matched'/'Uploaded' etc..
Any ideas anyone?
PC-OTHER, Other OS, Windows 10