Additional sign-in or account-related issues within Microsoft Teams for Education
Hi Aisha,
Based on your description, it sounds like the issue is not with your school Teams account itself, but with the Chromebook you're using.
Since the Chromebook belongs to your brother's school, their IT administrators can manage which websites and apps are allowed on the device. If they have blocked Microsoft Teams, that restriction would apply to all users of that Chromebook, including students from other schools.
Unfortunately, neither you nor your school can remove restrictions that are enforced by your brother's school's IT department. It's best to try accessing Teams from another device, such as a personal computer, tablet, or smartphone.
If Teams works normally on other devices or networks, that would further confirm that the restriction is coming from the managed Chromebook rather than your Microsoft account.
Good luck with your Geography exam! I hope you're able to regain access to your school resources soon. If you have any questions or need further assistance, please feel free to share them in the comments on this post.
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