Hi @Mr. C. Fox,
You can try using the "EdgeDefaultProfileEnabled" policy. You can log in to Edge using the school's email that is you are going to configure, and then use the Group Policy Editor to configure the policy in this profile. Please set the value to "Default". Once set up, you can use this profile the next time you open Edge again. For more information, you can check the link I provided you.
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Best Regards,
Jinxin Wang