MS Incident number 71192001. Over 2 weeks without resolution.
Business Critical. Posted in Windows Live Forum per tech support instructions, posting here per Windows Live Forum instructions. 'The user cannot log into the Dynamics CRM.
Invalid User Authorization. The user authentication passed to the platform is not valid. The Invalid User Authorization rather than the white page; I.
'Invalid User Credentials' error is displayed at upper left. The user has been set up in CRM. There have been several CRM invitations sent and replied to over the last few days as we tried to figure this out.
The Windows Live Profile is accessible. We have sent a confirmation email from the Live website several times but it does not get through. The email address is correct. There is no spam filtration. The same address is accessible by any other email host.
' As of this morning, other users are unable to log into the CRM from the Dynamics website. The error is 'The Windows Live Network is not available from this site for one of the following reasons: This site may be experiencing a problem. The site may not be a member of Windows Live.'

The user account does exist in Windows Live and the user can log into the Windows Live website, view and change his profile, etc.
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Above is a fairly common but vague error which I tend to run into often when doing a in-place upgrade, or organization import,/restore into deployment manager. This error generally appears for Dynamics 365 on-prem more then online. Depending on the situation, this error might appear sometimes or all the time while browsing the site.
Below is a list of fixes I have done for different scenarios to get me pass this, hopefully it’s helpful for someone. Clear the browser cache/cookies If doing an in-place upgrade, sometimes the cache/cookies from the previous CRM version produces strange results. Do a iisreset or server reboot Probably the most common and easiest method, after the initial import/in place upgrade, you might notice you run into this error randomly while browsing Dynamics 365.
Strangely a quick iisreset or server reboot fixes the problem. Enable CRM data encryption After a in place upgrade from CRM 2011 to Dynamics 365 in a development environment, one of our developers were testing the Microsoft Dynamics 365 for Outlook client. They were trying to access the installer by launching Dynamics 365 in the browser, clicking the gear icon in the top right corner and going clicking on “Apps for dynamics 365.” At that point, they would be greeted with the error, it happened on all accounts. After enabling data encryption by going to Settings > Data Management > Data Encryption, the error went away. Re-import/re-upgrade from SQL backup This is probably one of the last steps you want to take. I’ve ran into this error after a complete in-place upgrade.
While installing the 8.2.0.749 (KB3205084) patch, it said it completed successfully but if I viewed the logs, there was actually some SQL errors during the database upgrade. It looked like this left the CRM organization in some sort of limbo state. Whenever I tried to access CRM, I would be instantly greeted with the Invalid User Authorization error. The one thing I did notice was that in deployment manager, the organization build version was incorrect. In fact it wasn’t even a valid build number.