upgrade to Monterey trouble shooting blue tooth connectivity

"upgrade to Monterey trouble shooting blue tooth connectivity: Blue tooth connectivity lost when updated MacBook Air to Monterey"

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Troubleshooting Mac Bluetooth:

A. Confirm the Connection:

1. Go to: Apple menu
2. Hold Down: option key
3. Select: System Information
4. Click: Bluetooth
5. See if: any device is shown to be connected

B. Boot in Safe Mode:

In Safe Mode, Login Items do not run at login, certain preferences are set aside, and damaged system files are then reset. So, once booted in to Safe Mode, wait 30 seconds, and then boot up normally, attempting this once more. For instructions, go here: How to Use Safe Mode on your Mac - Apple Support

C. Try a New Admin User:

What happens when you create a new administrator user, and log into it? Do you still get this error? If not, then it is likely an error with the current user. If so, then it is likely an error with your Mac.

No Succes?...

D. Reinstall the macOS:

Go Here: How to Reinstall macOS from macOS Recovery - Apple Support. Important: Be certain to create a backup of your Mac prior to all of this. That way, you can have something to restore from the Mac from, should anything go wrong with the reinstall. Once reinstalled, try this once more.

Which model MacBook it is ?

have you checked is your Mac is compatible with the OS monetary .

try restarting the mac and check if the issue is solved or not .

if the same issue is persisting even after restarting the mac then restore the mac and intall OS again