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Welcome Anwar Ali Khan,
Thank you for posting on Microsoft Q&A. I understand you need your GSTIN on the invoice for the Windows 11 Pro license you bought, and I'm happy to help.
First, could you tell me:
- Which account did you use to buy Windows 11 Pro? Was it a personal Microsoft account (such as @outlook.com, @hotmail.com or @gmail.com), or a work or school account?
- Where did you buy it? From the Microsoft Store app on your PC, from the Microsoft Store website, or from a retailer or reseller?
Looking forward to your update.