Troubleshooting Microsoft Office 365 problems

SharePoint Tenant Configuration Failed with 401 (Unauthorized) or 403 (Forbidden) errors

SharePoint Tenant Configuration Failed with 401 (Unauthorized) or 403 (Forbidden) errors

Cause: This error occurs when certain app authentication are not provided.

Resolution:

Login to your SharePoint admin portal by navigating to https://[tenant]-admin.sharepoint.com
Navigate to Policies > Access control.
Click Apps that don't use modern authentication
Esnure Allow access is selected. If not, select it and click Save. Refresh the page to ensure the change has taken effect.

Download and install SharePoint Online Management Shell by following the steps listed here.
Connect SharePoint Online Management Shell with your SharePoint Online environment by following the steps listed here.
After successfully connecting with your SharePoint Online environment, run this command.

Set-SPOTenant -DisableCustomAppAuthentication $false

Wait 15 mins for the changes to take effect and try adding the tenant again in RecoveryManager Plus.
If the issue still persists, contact support@recoverymanagerplus.com.

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