Magic Mouse not responding after macOS 27.0.1 update

Since your Magic Mouse is showing as connected and its battery level is being reported, your Mac appears to be communicating with the mouse over Bluetooth. However, this does not necessarily mean that macOS is successfully receiving or processing its movement and click events.

Because the problem began immediately after updating to macOS 27.0.1, a Bluetooth or input-device software issue is one possibility, although we cannot yet establish that the update itself is responsible.

Since you didn't provide us with what you have tried so far yourself to resolve this issue, I suggest trying the following steps, in order:

1. Restart your Mac and Magic Mouse. Shut down your Mac, turn off the Magic Mouse, wait approximately 30 seconds, and then turn both devices back on.
2. Remove and pair the Magic Mouse again. Using your MacBook Pro's built-in trackpad, open System Settings > Bluetooth. Locate your Magic Mouse, select the information button (ⓘ), and choose Forget This Device. Turn the mouse off and back on, then pair it again.
3. Test the mouse in Safe Mode. If the issue persists, start your Mac in Safe Mode and check whether the mouse responds. This can help determine whether third-party software or startup components are contributing to the problem.
4. Test with another user account. If possible, sign in to another macOS user account and check whether the Magic Mouse works there. This may help distinguish a user-specific configuration issue from a system-wide problem.

If none of these steps resolves the issue, could you let us know whether the Magic Mouse's clicking and scrolling functions also fail, or whether only pointer movement is affected?

Finally, does the mouse work correctly when paired with another Mac or compatible device?

Update your Mac to the latest version of macOS. At the time of writing, macOS 27.2 is current.

This latest version fixes many issues introduced with macOS 27/27.0.1.