Siri isn't working

Start with this of M1 Mac...

Start up a Mac with Apple silicon in safe mode

On your Mac, choose Apple menu  > Shut Down.

After your Mac shuts down, wait 10 seconds.

Press and hold the power button on your Mac until the startup options window appears showing available startup disks and Options.

Select a startup disk.

Press and hold the Shift key, click Continue in Safe Mode, then release the Shift key.

To leave safe mode, restart your Mac normally, without pressing and holding any keys during startup.

To find out if it's system wide or user specific, try this...

Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.

Does it work in the new account?

The first thing to check would be if Siri is on. In system preferences Siri make sure Enable Ask Siri and Voice Feedback is checked. Then in Sound make sure Mute is not checked.https://techpp.com/2022/01/19/siri-not-working-on-mac-fix/#:~:text=1%20Restart%20your%20MacBook.%20The%20basic%20step%20to,...%205%20Check%20Mic.%20...%20More%20items...%20