I was working on some new tenant with the clients. There we had some requirement to create new SharePoint Provider Hosted App with App-Only principals. It was created successfully & working fine in my older tenant.
After testing of it, I deployed on newly created tenant where it has started showing issues :
I have registered a support ticket to Microsoft SharePoint team . They tried to support with lots of meetings & collected logs but they have not given the solution.
After did lots of research , I found the solution from Microsoft Q & A site. Lots of SharePoint experts are facing same issue. They have mentioned some workaround as well.
They are asking to run a command :
Set-SPOTenant -DisableCustomAppAuthentication $false
After running this command, every thing has started working.
Just one thing, You have to use latest SharePoint Online Management Shell.
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