CD tracks are in a format which music players can use. They are not in a format that can be used by programs like Music Maker (but I'm wrong about this - see below). You can of course extract (rip) CD tracks into a standard audio format.
Exactly which version and variant of MM do you have? If it is MM 2021 (64 bit) did you pay for the Upgrade to this new version (29.x.x.x) or have you merely Updated from an earlier version? If you simply updated what you now have is the Free version of MM, something which has caught out quite a number of users!
In the Full version of MM 2021 Premium there is an option under File>Import>Import tracks from audio CD (shortcut C). This seems to work as expected for me.
In the Full version of MM 2021 Premium there is an option under File>Import>Import tracks from audio CD (shortcut C). This seems to work as expected for me.