Error Code: 80090034

We received the following error message when trying to open Outlook.

This machine was removed from Azure AD and was joined to a local domain.

We have reset the TPM chip as per

But we are still getting this error message.


Actually I've found the solution on another forum

"I figured out the solution, and it makes sense. This Microsoft article titled "DPAPI MasterKey backup failures when RWDC isn't available" indicates that when a domain user logs in for the first time, and can't contact a read/write domain controller, then DPAPI keys can't be backed up. I'm guessing Office365 uses DPAPI to store your credentials.

I am a remote user. When I deleted/recreated my user account, I was NOT connected to the corporate VPN, so Windows may not have been able to backup my DPAPI keys to the domain controllers.

Not sure where the TPM errors came into play, as (as far as I know) DPAPI doesn't use TPM... but it could have been a generic cryptographic error."

Solution was to set this registry key:

HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\Protect\Providers\df9d8cd0-1501-11d1-8c7a-00c04fc297eb\ProtectionPolicy = 1 (DWORD)

11 people were helped by this reply


Did this solve your problem?

Sorry this didn't help.

Great! Thanks for marking this as the answer.

How satisfied are you with this reply?

Thanks for your feedback, it helps us improve the site.

How satisfied are you with this response?

Thanks for your feedback.


Question Info

Last updated September 16, 2020 Views 2,442 Applies to: