How do I access Azure AI Video Indexer ARM API Programatically?

Question

I'm quite lost here. For some reason, almost all documentation relating to my problems are bringing up a 404.

I'm trying to programmatically access Azure AI Video Indexer. I've downloaded (and slightly modified) the ARM API example from the github here:
https://github.com/Azure-Samples/media-services-video-indexer/tree/master/API-Samples/C%23/ArmBased

And set up my Azure resources. I created a Video Indexer service, as well an Entra ID app registration with the following permissions:
User's image

When I try to use the code to get an account access token (code):

   public static class AccountTokenProvider
   {
       private static readonly string clientId = "removed";
       private static readonly string clientSecret = "removed";
       private static readonly string tenantId = "removed";

       public static async Task

Answer

After a lot of trial and error, I managed to get this working.

For me, it was because I hadn't created the correct role assignment. It's also non-obvious how to do it.

Steps that fixed it for me:

Create the app registration in the portal (Microsoft Entra ID > App registrations > New registration) if not already done.
Copy the name of the app. You'll need it later!
Still in the portal, go to the Video Indexer resource that you created.
Go to Access control (IAM) > Role assignments > Add > Add role assignment.
Select Privileged administrator roles > Contributor.
Under Members, select "User, group, or service principal", then click Select members.
Here's the important bit: A right-hand pane appears with a list of users, but it doesn't include your app name. However, if you search for your app name, it appears. Click it, then click Select.
Click Review + assign.

You've now set up the correct role assignment for your app and the video indexer resource.

Once I'd done that, I could successfully generate the video indexer access token using the app's bearer token.

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How do I access Azure AI Video Indexer ARM API Programatically?

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