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I get an error using Outlook web interface on Firefox

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Adrian
Adrian

This has worked fine in the past, and works now in Chrome, but not Firefox. URL is https://outlook.cloud.microsoft/mail/?bO=1&msalAuthRedirect=true&sessionId=20fbbbb0-2fa6-4848-8fec-c20c6d3a8be4

Here's the error message

UTC Date: 2026-03-30T12:16:32.476Z Client Id: 05099EAAAC364C6EBD8115436A25F2D9 Session Id: 20fbbbb0-2fa6-4848-8fec-c20c6d3a8be4 Client Version: 20260320002.06 BootResult: fail Back Filled Errors: Unhandled Rejection: SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data:undefined|undefined:undefined|undefined:undefined|undefined:undefined err: Error: 401 esrc: StartupData et: ServerError estack: y@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.06b8e674.js:2:299099 165332/E/<@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.06b8e674.js:2:23542

st: 401 efe: BL0PR02CA0036

This has worked fine in the past, and works now in Chrome, but not Firefox. URL is https://outlook.cloud.microsoft/mail/?bO=1&msalAuthRedirect=true&sessionId=20fbbbb0-2fa6-4848-8fec-c20c6d3a8be4 Here's the error message UTC Date: 2026-03-30T12:16:32.476Z Client Id: 05099EAAAC364C6EBD8115436A25F2D9 Session Id: 20fbbbb0-2fa6-4848-8fec-c20c6d3a8be4 Client Version: 20260320002.06 BootResult: fail Back Filled Errors: Unhandled Rejection: SyntaxError: JSON.parse: unexpected end of data at line 1 column 1 of the JSON data:undefined|undefined:undefined|undefined:undefined|undefined:undefined err: Error: 401 esrc: StartupData et: ServerError estack: y@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.06b8e674.js:2:299099 165332/E/<@https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.06b8e674.js:2:23542 st: 401 efe: BL0PR02CA0036

All Replies (2)

SuMo Bot
SuMo Bot

Personal or work account? Windows home or pro? Are you running security software besides MS Defender?

Does it happen with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#search

Did you clear your browser cache? https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox

I'm on the site everyday and don't recall that url. Here is what I always see. https://outlook.live.com/mail

Just signed in now. see screenshot

SuMo Bot
SuMo Bot

When I click on your link, it brings me to the login page. see screenshot

Buza umbuzo

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