Issue:

I had a requirement to create a provider hosted app with App-Only Principals which needs to be hosted on the SharePoint Online tenant.

It was created successfully & working fine in my older tenant. 

After testing it, I deployed it on a newly created tenant where it has started showing issues :

Resolution:

We need to run the following powershell command to get this error fixed:

Set-SPOTenant -DisableCustomAppAuthentication $false

Note: Just one thing, You have to use latest SharePoint Online Management Shell

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Happy SharePointing!!!

By Sigar Dave

Technical Solutions Professional | Modern Workplace Architect Lead | Microsoft 365 | SharePoint | Power Platform | MS Teams | React

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