...
Access to the Azure Portal with administrative permissions.
An OIDc-registered application within Azure Active Directory.
...
1. Access the Azure Portal
Visit the Azure Portal and log in with your credentials.
...
On the application overview page, you will find the Application (client) ID. Note this ID as it is your Client ID.
7. Obtain the Client's Secret
To view or create a new client secret:
Click on Single sign-on → Go to application.
Click on Certificates & secrets.
To generate a new secret, click on New client secret.
Provide a description and choose the duration of the secret.
Once created, note down the value of the secret immediately as it will not be shown again.
...