Getting 2400 error in outlook application

Anonymous
2023-04-11T09:25:43+00:00

Hi,

Something went wrong [2400] error in outlook application. Web outlook is working fine.

Tried outlook repair, reinstallation, new profile creation and cleared password from device credential manager still issue persist. Seems like Microsoft issue. Screenshot attached

Please share any troubleshooting steps for permanent fix

Thanks

Anand

Outlook | Windows | Classic Outlook for Windows | For home

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  1. Anonymous
    2023-04-26T17:22:44+00:00

    So not sure if this helps anyone but for me what fixed it was uninstalling/reinstalling outlook. The key was to add the account causing this error first and then adding my additional accounts after that.

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  2. Anonymous
    2023-04-26T18:06:38+00:00

    Thanks for your reply. I've since managed to resolve the issue by reinstalling my outlook.com account via the Control Panel.

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  3. Anonymous
    2023-04-26T19:50:53+00:00

    Client has reported the problem today. They have two M365 mailboxes - their main one is working fine but a secondary mailbox (using an Exchange-only license) is throwing this error. Will check their 2FA status. Access via web browser is fine.

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  4. Anonymous
    2023-04-26T21:33:28+00:00

    It's a break cause by the most recent update.

    It is widespread.

    Stuff happens - for some reason In finding this a particularly annoying one.

    MS will have to fix it - if I figure out a work around I'll post back.

    My advice is downloading repair tools and reloading the app is a compete waste of time. Rarely is a solution. Hasn't been since the 80s 😎.

    Definately an authentication issue - luckily just with outlook.com (for me at least - I'm guessing everyone else too) ... just a maintenance account

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  5. Anonymous
    2023-04-27T06:08:40+00:00

    just following Tip 1 from 11 Tips to Fix Outlook Login Error [2023] (wondershare.com) did the trick!..

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