Prevent Windows 11 Update?

Delay upgrade to Windows 11 on eligible devices
If you need to, you can delay the upgrade of your Teams Rooms device to Windows 11 22H2 until November 20, 2023.
To delay the upgrade, you need to set the HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\PPI\\SkypeSettings\\CBU11 value to 1 (DWORD). We recommend setting the CBU11 value using group policy, Intune, or remote PowerShell. Alternately, you can complete the steps below on each Teams Rooms device.
Important
If you want to temporarily delay the Windows 11 upgrade on eligible devices, you need to set the CBU11 value before June 20, 2023.
Switch to admin mode on your Teams Rooms device.In admin mode, open Registry Editor.Go to the HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\PPI\\SkypeSettings registry key. If it doesn't exist, create it.Create the value CBU11 and set it to 1 (DWORD).Once the CBU11 value is set, the device won't be upgraded to Windows 11 until November 20, 2023. If you're ready before November 20, 2023, delete the registry key to resume the upgrade.
For more information : https://learn.microsoft.com/en-us/microsoftteams/rooms/rooms-lifecycle-support#delay-upgrade-to-windows-11-on-eligible-devices