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Outlook Error 0xCAA70004 after updating to Windows 10 1809

Anonymous
2018-10-09T19:20:59+00:00

After updating from Windows 10 1803 to 1809, I picked up an interesting outlook authentication problem.

My installed Outlook app now generates an error 0xCAA70004, which is a connection error of some type. 

The exact error message displayed is "We Can't Connect You" .

I've done all the normal things which include:

Running the Outlook diagnostic (setupOP) to clear credential cache and more

Tried creating a new profile

Unloaded ALL Office 365 apps and then reinstalled.

None of the above worked, and all my other Office365 apps are fine, including the re-authorization once re-installed.

Now when using the outlook diagnostics, everything starts normal then it seems to fail at "validating user autodiscover authentication" which then displays the message "Can't sign in using my email account."

Now this is a non-domain workstation as well.

Anyone have any ideas, before I downgrade back to 1803?

Kind Regards

Al

Outlook | Windows | Classic Outlook for Windows | For home

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Anonymous
2018-10-09T20:06:38+00:00

Hello AI,

Thanks for posting here.

From your description, please restart your PC firstly then check if there is any improvement when you run the Outlook in safe mode. Also, make sure you can login to office portal with this Office 365 for Business account successfully.

Meanwhile, for better help you, please send us a screenshot about the error 0xCAA70004. Also, let us know the detailed version of Outlook client. Note: You can get the version from Word, Excel, or PowerPoint.

Regards,

Rudy

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  1. Anonymous
    2018-10-09T20:24:26+00:00

    Hello AI,

    Thanks for posting here.

    From your description, please restart your PC firstly then check if there is any improvement when you run the Outlook in safe mode. Also, make sure you can login to office portal with this Office 365 for Business account successfully.

    Meanwhile, for better help you, please send us a screenshot about the error 0xCAA70004. Also, let us know the detailed version of Outlook client. Note: You can get the version from Word, Excel, or PowerPoint.

    Regards,

    Rudy

    Rudy,

    Yes, I can log into the office portal with no issues and Outlook safe mode did not help the issue even after the reboot.  I've been fighting this issue for days and thought I tried everything.

    So in one last final attempt, I enabled IPv6 and then rebooted the computer.  Presto - it works but I can't believe the fix was that simple.  And since it's working now, I really do NOT want to disable IPv6.

    So problem solved, but not 100% sure why.

    Regards Al

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  2. Anonymous
    2018-10-15T19:14:03+00:00

    Rudy,

    Yes, I can log into the office portal with no issues and Outlook safe mode did not help the issue even after the reboot.  I've been fighting this issue for days and thought I tried everything.

    So in one last final attempt, I enabled IPv6 and then rebooted the computer.  Presto - it works but I can't believe the fix was that simple.  And since it's working now, I really do NOT want to disable IPv6.

    So problem solved, but not 100% sure why.

    Regards Al

    Want to throw in my thanks on this.  I've had IPv6 disabled on my machine because I've been having sporadic issues at home with Youtube because of it (likely an ISP issue).  I've been hitting this same issue since I updated Windows as well. Tried disabling IPv6, and it was happy again too.  Thanks!

    Respectfully,

    Jonathan

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  3. Anonymous
    2018-10-17T14:56:22+00:00

    Hi,

    I'm facing the same problem here. Had Office x86 installed when the problem started, changed to x64 and it apparently solved the problem.. For two days.

    I'm actually using OWA, but really need to configure my account on Outlook, but I keep getting the same error (0xCAA70004).

    Tried what Al did, but no success here. Any other options?

    Best regards,

    Flávio

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  4. Anonymous
    2018-10-10T01:51:56+00:00

    Hi Al,

    Thank you for getting back the result to us and we are glad to hear your issue has been resolved now. Wish you a nice day.

    Best regards,

    Jennifer

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