Steps to Retrieve Account ID:
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Click on Menu
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Click on Cost Management + Billing.
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Click on Properties
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Copy the Account ID
Steps to Retrieve Tenant ID:
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Click on Menu
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Search for App Registration
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Click on your application
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Copy the Application Client id & Tenant id
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Client Secret is already copied in Step-1: Create Microsoft Entra ID app
Make sure to record all of the details that are retrieved, as they will be needed for the manual creation of a billing account.