Microsoft Surface Mouse (Bluetooth).
https://www.microsoft.com/accessories/en-us/support/troubleshooting/mouse/supported-devices
Not listed.
See if you can find your "Surface Mouse" here (e.g. by checking Bluetooth under Features)
https://www.microsoft.com/accessories/en-us/mice
Notice that if it was a Bluetooth Mobile Mouse 3600 you would have MMKC support
but if you had a Bluetooth Designer Mouse you wouldn't (i.e. Downloads indicates MMKC is available in the first case but not the second.)
Oh. This one?
https://www.microsoft.com/en-us/store/d/surface-mouse/8qbtdr3q4rpw?activetab=pivot:techspecstab
No extra buttons, so no need for MMKC?
That's not it either. They both have a "wheel button" and otherwise equivalent functionality. What's the difference?
https://www.microsoft.com/en-us/store/d/surface-mouse/8qbtdr3q4rpw?activetab=pivot:techspecstab
Here the (seemingly arbitrary) distinction is that one has "Customizable features available for Windows", the other doesn't.
FYI
Robert Aldwinckle