@陳子毅,Thanks for posting in Q&A.
From your description, I know you want to restrict users to only connect to M365 using their own account.
Based on my research, there is no such feature in Intune can achieve this, if you want Intune to implement this feature, you can submit your feedback to Intune.
https://feedbackportal.microsoft.com/feedback/forum/ef1d6d38-fd1b-ec11-b6e7-0022481f8472
Thanks for your kind understanding.
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