My goal is to write some code to enable an Office 365 user to access files in OneDrive for business via REST API. I have registered an application in Azure AD (Web App/single tenant) and have a redirect URI to receive the OAuth token. I want to use the "delegated user identity with OAuth" scenario. To see how it works, I use the "Office 365 OAuth Sandbox" here: https://oauthplay.azurewebsites.net/. When I "Authorize using own account" and enter any valid Office 365 user credentials, I get an access token back. When I replace the client ID and redirect URI in the authorization URL with the info of my registered app, I can only get the token when I enter a user registered in my app (otherwise I get an error 50012 during sign-in). What do I have to change in my configuration to allow any Office 365 user to get an authorization token (like the Sandbox does) ?
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You need to mark your web application as multitenant, or Azure AD will constrain all callers to be from the tenant in which you provisioned the application. Take a look at https://github.com/AzureADSamples/WebApp-WebAPI-MultiTenant-OpenIdConnect-DotNet for an example of a web app that is multitenant and invokes a Microsoft API. Note that you don't necessarily need to validate issues as shown in the sample, just do what makes sense for your scenario (which might mean even not validating).
