Hello
Thank you for your question and reaching out. I can understand you are having query\issues related to prevent Windows 10 upgrading to Windows 11.
I believe they won't upgrade if they are managed thru Intune. You need to configure the deployment so the client would be able to upgrade to Windows 11.
Below are some reference threads.
https://learn.microsoft.com/en-us/answers/questions/580143/intune-how-to-prevent-windows-11-upgrade
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