Unable to access existing Azure subscription — billing documentation and account recovery assistance needed

I need assistance with an existing Azure subscription that was established using a personal Outlook.com account that Microsoft no longer recognizes.

The subscription continues to generate monthly charges, and invoices have historically been emailed to me. However, I did not receive an invoice for the most recent charge and need a copy for our financial records. I also need to restore administrative access to the existing Azure subscription.

I've contacted Microsoft by telephone but have repeatedly been directed to submit a support request through the Azure portal, which I cannot access using the original account.

Could you please assist with:

Locating and providing the invoice for the most recent charge.

Confirming the status of the existing subscription and associated resources.

Initiating the appropriate account ownership verification process to restore access to the subscription through a functioning Microsoft identity.

I can provide previous invoice numbers, the billing profile reference, or other verification information through a secure channel.

Thank you.