Identical Azure apps do not work in different tenants
I use Azure apps to sign users in to a web app and a desktop app. I also query for user information via Microsoft Graphs /user/ endpoint. So we have to apps registered in Azure; one is a web app / api with permissions to sign users in and read all user profiles from graph. The other is a native app with permissions to the first app, and permissions to sign users in.
In one tenant, this works fine. However in the other tenant the web api har permissions to sign users in, but Graph declines access to the /users/ endpoint due to insufficient privileges. The error is: Authorization_RequestDenied, Insufficient privileges to complete the operation.
However the exact same privileges work fine in another tenant. In the faulty tenant we get a token from graph but when we use the token on the user endpoint it throws the insufficient priv. error.
Signing in users via the desktop app (we use owin) works in one tenant but in the faulty one it sais that app tenant.onmicrosoft.com/guid does not exist in tenant.onmicrosoft.com The app uri is correct in the settings and the app has the same privileges in both tenants.
We tried recreating the apps since this has solved similiar issues when developing things like this before. This time it doesnt seem to work however. Now I'm at my wits end here. Could there be some other issue blocking here? The faulty tenant is part of a multi-tenant. However we only poll for users in one tenant as of now.
The apps have also been given consent by an admin via the azure portal. What am I missing here? How should i proceed with trying to fix this error?
You need to receive Admin Consent for an administrator of the tenant. I'm assuming that because this happens when hitting
/users, you've requested either
User.ReadWrite.All. Both of these require Admin Consent before a normal user can authenticate and provide User Consent.
I wrote an article a while back that you might find this helpful here: User vs Admin Consent. The examples target the v2 Endpoint while it sounds like you're using v1. That said, the same consent models and workflow apply to both v1 and v2.