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Login Request Expired is locking me out of school email

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Although I can access every other aspect of my school account, I am locked out of email by a screen telling me: "Your login request has expired. Try logging back into the application" with the accompanying tab reading: "Universal Prompt Error".

Regardless of my logging out and trying again, and rebooting my computer, contacting the school's IT dept, I continue to be locked out through Firefox. Chrome will let me in.

Please help me resolve this problem.

Although I can access every other aspect of my school account, I am locked out of email by a screen telling me: "Your login request has expired. Try logging back into the application" with the accompanying tab reading: "Universal Prompt Error". Regardless of my logging out and trying again, and rebooting my computer, contacting the school's IT dept, I continue to be locked out through Firefox. Chrome will let me in. Please help me resolve this problem.
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This is one possibility:

Firefox recently rolled out "Total Cookie Protection" to more users. This limits how sites can use "third party" or "cross-site" cookies, meaning cookies from different websites than the one you see in the address bar. If you notice that there is a different address in the address bar between the main school server and the sign-in page, or between the sign-in page and the email server, then this cookie restriction could break the connection.

You can make exceptions to this feature when needed by turning off Enhanced Tracking Protection on each different server that you end up getting switched to. More info in the following articles:

Does that work for you?