Setup access for the Power Platform API using a Service Principal (secret)

 Overview: I had a hard time setting up my tenant to use the Power Platform API, so here are my notes.

1. Register a new App that will be the Service Principal (SP)

Open https://portal.azure.com and login, and open your Azure Active Directory (mine is Radimaging Ltd) > Click "App Registrations" > "New registration" > add the registration as shown below:

Click the "All applications" tab and verify that the SP has been created.  Click the application to go into it.  Mine is called "Power Platform SP".

2. Give the SP permissions to use the Power Platform API's

Click "API permissions" > "Add a permission" > select the tab "API's my organization uses", search for the "Power Platform API" ensure it has the Application(Client Id) of "8578...".  

    Optional: If the API does not show up, use Power Shell to add it. 

Add permissions.  These are the permissions I added:

Click the "Grant Admin consent for ..." I did this but not sure if it is needed.

I also change the authentication setting on the SP to "Allow public client flows"

3. Use postman to check you are generating the Access token