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Once you are logged into Azure, Register a new application so you can access
the Microsoft Graph API. To register a new application go to your Azure Active Directory
and once there go down to App Registrations a new window will pop up.
Step 3: Register a New App
Set name of your choice.
Select supported account type
You don't have to set redirect URL.
Step 4: Generate client secret
Go to your application → Certificates & Secrets → New client Secret
Note
You'll need Tenant ID, Client ID & client Secret Value for authentication (Tenant ID & Client ID are available under application overview and for Client Secret go to Certificate & Secrets section).
Make sure your application has adequate permissions.
To add permission, Go to your application → API permission → Add permission (some of the permissions will require admin consent)
For Excel app we need Files.ReadWrite.All, Sites.ReadWrite.All, User.ReadWrite.All permissions.