Office365 authentication with user 'x' on 'https://x.sharepoint.com/x/sites.asmx' failed

Error Examples:

Error reading from entity 'X': Office365 authentication with user 'xxxxxx' on 'https://x.sharepoint.com/xxx/sites.asmx' failed: Cannot contact web site 'https://x.sharepoint.com/' or the web site does not support SharePoint Online credentials

Error reading from entity 'X': Office365 authentication with user 'xxxxxx' on 'https://x.sharepoint.com/xxx/sites.asmx' failed: The sign-in name or password does not match one in the Microsoft account system.

Office365 authentication with user 'xxxxxx' on 'https://x.sharepoint.com/xxx/sites.asmx' failed: Root element is missing.

Cause

The issue is caused by SharePoint recently moving away from the older authentication method Office365. It is possible your tenant now requires the newer Microsoft_Modern authentication method.

Resolution:

Change the authentication method in the connection string to "Microsoft_Modern":

Authentication=Microsoft_Modern;

If you want to write to the modification date field, you need to use "Microsoft_Modern_Admin". Specific details about this authentication can be found in the Knowledge Base Article "Authentication=Microsoft_Modern_Admin".

More information on the Microsoft_Modern authentication can be found in our Layer2 Cloud Connector User Documentation.