You can reach store support here.
https://support.microsoft.com/en-us/account-billing/contact-microsoft-store-support-4f615f2a-6bbd-fd69-6695-ae213d63eef0
--please don't forget to upvote and Accept as answer if the reply is helpful--
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Ordered Win 11 from MS directly, have receipt but lost key. Where/How can I retrieve my key?
You can reach store support here.
https://support.microsoft.com/en-us/account-billing/contact-microsoft-store-support-4f615f2a-6bbd-fd69-6695-ae213d63eef0
--please don't forget to upvote and Accept as answer if the reply is helpful--
As you've receipt and hopefully the order number, you can reach out to Microsoft Store support and they'll surely help you with this.