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This is a straightforward option for smaller deployments or scenarios where users or IT administrators can configure enroll devices individually.
Steps:
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Install the Intune Company Portal app
Intune Company Portal is the app that lets you, as an employee or student in your organization, securely access your apps, data and resources.
Once you have installed the Company Portal app on a PC and signed into the app using your Entra ID account, the PC will be also enrolled in Intune.
Please refer to the official guide below.
https://learn.microsoft.com/en-us/mem/intune/user-help/sign-in-to-the-company-portal
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