Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear @Phyoe Wai Khant,
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For Microsoft 365 business subscriptions, it is possible to receive two invoices for the same subscription in the same month during renewal or billing-period changes. It is said that these invoices may be for different service periods, and this can be checked on page 2 of the invoice PDF or in Billing > Bills & payments in the Microsoft 365 admin center.
If both invoices cover the same subscription, same license quantity, and same service period, then it may be a duplicate billing issue. Understand your invoice for your Microsoft MCA billing account | Microsoft Learn