Resolved: SharePoint Online web site does not support SharePoint Online credentials

Resolved: SharePoint Online web site does not support SharePoint Online credentials

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This afternoon, while working on my upcoming book for the MS-300 exam, I was attempting to sign into SharePoint Online via PowerShell and encountered this moderately cryptic message:

Cannot contact web site 'https://tenant-admin.sharepoint.com/' or the web site does not support SharePoint Online 
credentials. The response status code is 'Unauthorized'. The response headers are 'X-SharePointHealthScore=7, 
X-MSDAVEXT_Error=917656; Access+denied.+Before+opening+files+in+this+location%2c+you+must+first+browse+to+the+web+site+
and+select+the+option+to+login+automatically., SPRequestGuid=0da41d9f-c07d-0000-475a-d8ba3cbd9de9, 
request-id=0da41d9f-c07d-0000-475a-d8ba3cbd9de9, MS-CV=nx2kDX3AAABHWti6PL2d6Q.0, 
Strict-Transport-Security=max-age=31536000, SPRequestDuration=65, SPIisLatency=20, 
MicrosoftSharePointTeamServices=16.0.0.19513, X-Content-Type-Options=nosniff, X-MS-InvokeApp=1; RequireReadOnly, 
X-MSEdge-Ref=Ref A: C396F4495761409EBD63C56024B3F45C Ref B: CH1EDGE1220 Ref C: 2019-12-02T19:26:24Z, Content-Length=0, 
Content-Type=text/plain; charset=utf-8, Date=Mon, 02 Dec 2019 19:26:24 GMT, P3P=CP="ALL IND DSP COR ADM CONo CUR CUSo 
IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI", X-Powered-By=ASP.NET'.

It was displayed in its normal crimson beauty, as you can see below:
Resolved: SharePoint Online web site does not support SharePoint Online credentials

I decided to go see what dials I had configured.  Turns out, it was not anything in the Azure Portal under Conditional Access.  What I did have enabled, however, were a pair of settings when I was testing other application restriction methods, both of which are configured in the SharePoint Online Admin Center (https://tenant-admin.sharepoint.com).  The settings were under Access Control | Unmanaged Devices and Access Control | Apps that don’t use modern authentication:
Resolved: SharePoint Online web site does not support SharePoint Online credentials

Resolved: SharePoint Online web site does not support SharePoint Online credentials

Setting both of those to Allow access enabled me to connect to SharePoint Online via PowerShell after about 30 minutes.

Alternately, if you’re in a rush (and your settings look like mine), you can try skipping the -Credential parameter altogether and wait for the modern authentication web dialog prompt. 😉

Resolved: SharePoint Online web site does not support SharePoint Online credentials

Happy SharePointing!

Published by Aaron Guilmette

Helping companies conquer inferior technology since 1997. I spend my time developing and implementing technology solutions so people can spend less time with technology. Specialties: Active Directory and Exchange consulting and deployment, Virtualization, Disaster Recovery, Office 365, datacenter migration/consolidation, cheese.

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