Use Manually Created Application Registration

Once the customer has created an Application Registration on their tenant, you can use the following methods to authenticate the connection between Live Platform and the customer M365 Azure tenant platform:

The customer provides you with their Tenant ID and the Application Registration Application (Client) ID and Client secret of the Application Registration on their M365 tenant. See Authenticate Directly from Onboarding Wizard.
The customer receives an email link triggering the Invitation wizard through an email link sent to the customer. See Send Customer Email Link to Invitation Wizard.