Apps visible in Azure AD, but not in PowerBI

[heyadamhey]

I've subscribed for the 60 day Pro trial and I used the Web UI (https://dev.powerbi.com/apps) to create a few apps, which appear in my Azure portal under Azure AD > App Registrations. These apps, however, do not appear in my Power BI instance.

From the "Embed Setup" (https://app.powerbi.com/embedsetup) page, I also created an application and downloaded the sample app, which comes configured with the GUIDs for the app that was just created, but this app does not appear in my PowerBI account.

When I run the sample app I get three buttons, but I get an error when I press any one of them

What am I doing wrong?

[heyadamhey]

Update: when I run the application with the settings that were generated with it (I chose to use the sample data), it does generate an embedded report, but no dashboards or tiles are available. So that's fine, but I can't access this application from my PowerBI account (same MS account). This application does appear in my Azure portal though.

It doesn't make sense to me

[heyadamhey]

Another update:
I went back to the Embed Setup page and created a "User owns Data" embedding solution. This created an app and gave me an app Id and workspace ID etc. And I was able to run the project and click "Embed Report" and view the embedded report. 

When I tested installing the Github app and using the app/workspace/report Ids in my VS project and click "Embed Report", I get the following error

Error

AADSTS700016: Application with identifier '5c7d26d1-006d-43ac-9eb7-6aa3e1f6b364' was not found in the directory 'foo.onmicrosoft.com'. This can happen if the application has not been installed by the administrator of the tenant or consented to by any user in the tenant. You may have sent your authentication request to the wrong tenant.
Trace ID: e77376aa-b7ca-4c09-9184-31f96eea9800
Correlation ID: d42a0b9c-c93d-4601-87d6-05d9cca70e0d
Timestamp: 2019-06-04 15:59:58Z
        

Why can't I access this? my webconfig is using the login credentials that I am using to login to Power BI. Also, in Azure Portal, this app does not appear in app registrations