@Toh Thanks for posting in our Q&A.
Intune supports macOS's version is 10.15 and later. In our official, it doesn't limit the device type of Mac.
https://learn.microsoft.com/en-us/mem/intune/fundamentals/supported-devices-browsers#apple
We can follow the steps to enroll MacOS:
Step1: Get the Apple MDM push certificate
https://learn.microsoft.com/en-us/mem/intune/enrollment/apple-mdm-push-certificate-get
Step2: Download company portal app and enroll the Mac.
https://learn.microsoft.com/en-us/mem/intune/user-help/enroll-your-device-in-intune-macos-cp#enroll-your-mac
For the whole process, please watch the vedio:
https://www.youtube.com/watch?v=CIvoBM9R5N4
Note: Non-Microsoft link, just for the reference.
Hope it will help.
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.