Navigate to the Azure portal home page and sign in using the credentials of an administrator.
Select App registrations.
Select New registration.
In the Register an application section, enter a meaningful application name to display to users. Select who can use this application based on your environment and click Register.
Once you have registered your application, your Client ID will be displayed in the Application (client) ID field within the Essentials.
After registering a new app in the step above, you can now generate a client secret for that specific application. Navigate to Certificates & secrets under Manage, and click New client secret.
A pop-up modal will appear, prompting you to enter your secret’s Description and Expires values. Fill these then click on Add.
Once completed, your Client Secret will be generated. This value can be found in the Value field within the Client Secrets table.
After generating the Client Secret, you must grant the registered application the necessary permissions for SharePoint Online. To do this, navigate to API permissions, select Add a permission, and choose Microsoft Graph.
Select Application permissions, choose the required permissions, and then click Add permissions.