How To Federate One Azure AD Environment to Another?

Could someone please provide guidance on how to federate one Azure AD tenant with another?  We have recently create a net new AAD environment and wonder about the steps in federating identity to another AAD environment.  

Thanks in advance for any advice or links!
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Vasil Michev (MVP)Commented:
You can't, at least not in the full sense if the word. Best you can do is configure B2B:

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mikeagonistesAuthor Commented:
Thanks, Vasil!  Very helpful as always.  

So, with the B2B, you set up authenticated guest user access.  I see specifically the linked article mentions app sharing.  Does the policy setting also allow for defined group access to environment resources?
mikeagonistesAuthor Commented:
Is guest user access policy via B2B the best/only method for SSO for resource access between one AAD and another?
mikeagonistesAuthor Commented:
If we set up ADFS (subnets, storage pools, VMs, WAP etc) would we be able to federate between AAD in the more traditional sense.  

I am really trying to understand what federation options are available to AAD. Thanks for any help.
Vasil Michev (MVP)Commented:
You cannot setup AD FS against an AAD directory, you need "traditional" AD for that. There are really no federation options available currently, although Microsoft is working on this and we should see such functionality in the future. B2B can work with most applications, and any app that is designed as multi-tenant can leverage the fact that AAD is the auth provider for all O365 tenants and provide you some sort of "federation". For example, this is what Microsoft is doing with the Azure Information Protection feature, where you can "share" documents securely with any other organization using AAD.
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