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 :
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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