Hi @Ricardo Lacal
Welcome to Microsoft Q&A, Thanks for asking question here...!
Transfer the billing Ownership of an Azure Subscription follow the below steps,
- Sign-in into Azure Portal.as an administrator of the billing account that has the subscription that you want to transfer. If you're not sure if you're an administrator.
Please read attached link.
2.Navigate to Subscriptions and Select the one that you want to transfer.
3.At the top of the page, select Transfer billing ownership.
4.On the Transfer billing ownership page, enter the email address of a user that is a billing administrator of the account that becomes the new owner for the subscription.
5.If you're transferring your subscription to an account in another Microsoft Entra tenant, select Move subscription tenant to move the subscription to the new account's tenant.
6.Select Send transfer request.
7.The user gets an email with instructions to review your transfer request.
8.To approve the transfer request, the user selects the link in the email and follows the instructions. The user then selects a payment method that is used to pay for the subscription.
9.If the user doesn't have an Azure account, they have to sign up for a new account.
Important Points to Remember:
Not all types of subscriptions support billing ownership transfer. You can transfer billing ownership or request billing ownership for the following subscription types.
Once Please read the attached links:
For Determine account billing admin: https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/add-change-subscription-administrator#whoisaa
Transferring subscription to an account in another Microsoft Entra tenant.
https://learn.microsoft.com/en-us/azure/cost-management-billing/manage/billing-subscription-transfer#not-all-subscription-types-can-transfer
Please let me know if you required anything.
Thank You.