Hello,
If this is a school-managed Windows 11 Enterprise LTSC device, the most likely cause is that screen recording has been disabled by your school's IT policies, or the recording application is not installed.
Windows LTSC editions often do not include consumer components such as Xbox Game Bar by default, which is the built-in screen recording feature many users access with Win + G. [pages.alph...solway.com], [github.com]
Try pressing Win + G. If you receive a message such as "You'll need a new app to open this ms-gamingoverlay link", Xbox Game Bar is not installed on the system. This is common on LTSC editions. [github.com], [reddit.com]
Since this is a school-owned device, you may not have permission to install screen recording software or modify Group Policy settings. In that case, you will need to contact your school's IT administrator to determine whether screen recording has been intentionally restricted and whether an approved recording tool is available.
If you can provide the exact error message you receive when attempting to record your screen, I can help determine whether the issue is caused by LTSC limitations, a missing application, or a school policy restriction.
I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!
Domic Vo.