Hello again Marta Łyskanowska,
Have you found the answer useful? To follow up with your case, your request currently lacks the name of the Microsoft contracting entity listed on your invoice (e.g., Microsoft Ireland Operations Ltd, Microsoft Corporation, or Microsoft Regional Sales Pte Ltd), which is technically required because Tax Residency Certificates are legally distinct per entity and not universal.
Please confirm your billing entity. Without that specific detail, the most robust path is to navigate to the Microsoft 365 Admin Center, expand Billing, select Bills & payments, and open the Tax profiles tab where we index certificates by entity and fiscal year; if you are an Azure customer under a Microsoft Customer Agreement (MCA), you must instead check the Azure Portal under Cost Management + Billing within the Tax documents section of your billing profile. Since you specifically require the 2026 certificate and we are early in the fiscal calendar, be aware that official IRS Form 6166 or local authority delays often prevent immediate portal indexing in Q1. If the 2026 file is absent from the aforementioned tax profile repository, you must open a support ticket strictly categorized under Billing and Subscription Support to have the tax operations team manually retrieve and forward the signed legal PDF.
VP