Javascript Web App Sample fails with auth errors

I cloned the repo, ran NPM, created an app ID as described, and ran the app. Login completes successfully. However, when I click the "Call DevOps Rest API" button, nothing happens except an error in my chrome Windows that says:

ServerError: invalid_client: AADSTS650057: Invalid resource. The client has requested access to a resource which is not listed in the requested permissions in the client's application registration. Client app ID: [redacted]. Resource value from request: 499b84ac-1321-427f-aa17-267ca6975798. Resource app ID: 499b84ac-1321-427f-aa17-267ca6975798. List of valid resources from app registration: 00000003-0000-0000-c000-000000000000.
Trace ID: c9a71cf7-bc64-446e-80f0-b9dc47c35600
Correlation ID: ca198b06-4d06-4d45-8dfa-835540dd27ea
Timestamp: 2022-04-22 20:18:07Z

Is there a missing documentation step where I'm supposed to grant my app permissions to access resource 499b84ac-1321-427f-aa17-267ca6975798? How would I do that?

Start with the Javascript Web App Sample setup instructions and the app-registration permissions used by the "Call DevOps Rest API" button. Reproduce the authentication flow and compare the requested resource with the registered permissions; done means the button successfully calls the DevOps REST API without the invalid_client error.