Unable to contact SharePoint or website unable to support SharePoint credentials

 Error: "Cannot contact web site 'XXXX-admin.sharepoint.com' or the web site does not support SharePoint Online credentials".

You will likely see this error if you have disabled the ability for non-modern (legacy) authentication protocols within your SharePoint Online tenant.

To migrate to a SharePoint Online Tenant, you first must enable legacy authentication protocols. To do this, run the below commands against your SharePoint Online tenant:

Connect-SPOService -URL https://XXXX-admin.sharepoint.com
Set-SPOTenant -LegacyAuthProtocolsEnabled $True
Note: You will need to update the URL to include the correct tenant name. This can be found by performing the following steps within your Microsoft 365 tenant:
  1. Log in to the Microsoft 365 Admin Center.
  2. On the left side of the portal, expand Admin Centers.
  3. Click SharePoint.
  4. Take the URL from the address bar​.

Alternatively, you can go into the SharePoint Online admin center and under Access control choose Apps that don’t use modern authentication then click Allow.

Note: Changes may take up to 24 hours to take affect.





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