How to implement Single Sign On using SAML 2.0 in ADX (community) Dynamics CRM Online portal - dynamics-crm-2011

How to enable portal for Single Sign On in Dynamics CRM online version.
We have online dynamics 365 with community portal and we also have one website from which user will login and click on community portal link.
After clicking on that link portal should in ask for user id and password and automatically it will sign in using website credential
Application details
Dynamics 365 Online.
ADX portal enabled (community Portal).
Website for customer (end user used to login)

Here is a post that describes how to configure ADFS and Dynamics Portal
https://community.dynamics.com/crm/b/microsoftdynamicscrmsolutions/archive/2016/11/11/sso-configuration-for-crm-portal

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SharePoint 2016 On-premises and Azure B2C

Does anyone know if Azure B2C works with SharePoint 2016 on-premises? This SharePoint environment in question is for external users not internal users. The objective is to move away from SQL Forms Based Authentication (FBA) to Azure.
As per this article below, in combination with Claims Provider, it is easy to configure:
https://learn.microsoft.com/en-us/azure/active-directory/saas-apps/sharepoint-on-premises-tutorial
However, Microsoft's B2C FAQ says that:
"Azure AD B2C is not meant for the SharePoint external partner-sharing scenario; see Azure AD B2B instead". But Azure B2B is out of scope.
Azure AD B2C is not meant for the SharePoint external partner-sharing scenario. Please raise the new user voice or vote for similar user voice.

Missing Azure USGov Sharepoint Online API Access option in App Registration

When creating a new application registration in Azure USGov I do not have SharePoint Online as an option under required permissions. Only AAD, Graph, WASM, and O365 Management API's. What am I missing?
do you see "Office 365 SharePoint Online" as an option? Below is what I see as options.

Office 365 Add-in with Oauth2 Authentication

I am making Office 365 add-in for Outlook web and SharePoint. As per the documentation, I need a developer account to register my add-in. The developer account for company is for $99.
I also wanted to authenticate user using his office 365 subscription. The documentation tells that an Azure account is needed for office 365 authentication, in which the app will be registered. Azure account is for $99 for company.
Now my question is that, as I have to register office 365 add-in and also enable authentication, do I need to buy both accounts each for $99 that cost $198. Or only one account serves my purpose ? It will be really helpful if any one having experience with office add-in can suggest some good resource to do this.
After you have the Office 365 developer account, you don't have to buy the Azure subscription to register the app to the Azure Active Directory. Because the Office 365 account already have a free subscription to Azure Active Directory.
And to activate this subscription and access the Azure management portal, you have to complete a one-time registration process. Afterward, you can access Azure AD from your Microsoft service that uses it(refer here about detail).
And it is recommend that you register the app through the Application Registration Portal at http://apps.dev.microsoft.com/ since it supports 'V2' which allow developers to write apps that accept sign-in from both Microsoft Accounts and Azure AD accounts, using a single auth endpoint(V2 endpoint).

How to obtain Azure AD token inside Office 365 Outlook (or office apps) add-in?

I need the token in order to use office api discovery service (https://api.office.com/discovery/) to find SharePoint root url.
Is it possible to get access to Azure AD token from add-ins (Outlook/Office)?
Edit(To make things more clear):
As I'm building a multi-tenant Azure hosted app that should be launched via add-ins, I will have to force users to log-in in popup and give consent for application. Login is mandatory since in office add-in's we cannot find out who the logged in user is.
You can follow the documentation here on how to retrieve an authorization token - https://graph.microsoft.io/en-us/docs/platform/rest from Azure AD for the use of finding the root URL - also you can use the Microsoft Graph, which is the newer version of the Discovery service (more details about it again at the link provided).

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This is possible in SharePoint 2010 but is it doable in CRM 2011? Or am I required to use ADFS? I'm assuming it is however I'm unable to find any guidance on how to accomplish it.
Any advice is appreciated.
Jason
Based on the Implementation Guide of Dynamics CRM 2011 it could be possible to use your own claims provider.
When you configure Microsoft Dynamics CRM for Internet-facing access, Microsoft Dynamics CRM 2011 requires federated services that support claims-based authentication. We recommend Active Directory Federation Services 2.0.
See Federation and claims-based authentication support

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