If you're both an employee and a student, you may need to access two separate Microsoft 365 (M365) accounts [Employee Account and Student Account] on the same device.
Switching Accounts Manually
Use this method if you only need to access one account at a time.
Steps:
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Go to https://outlook.office.com/
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Click your profile icon in the top right corner
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Select “Sign in with a different account”
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Log out of the current account
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Sign in with the other StarID account
Tip: This works for all services using Entra ID authentication, including Microsoft 365.
For additional options, see: Switching Between Your Employee and Student Accounts