Hello there,
Might be due to your setup.
Pass-through Authentication and federation rely on on-premises infrastructure. For pass-through authentication, the on-premises footprint includes the server hardware and networking the Pass-through Authentication agents require. For federation, the on-premises footprint is even larger.
More information here
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/connect/how-to-connect-fed-whatis
Hope this resolves your Query !!
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