Please see the accepted answer in the following thread.
Upgrade from Windows 11 Home Single Language to Windows 11 Pro via Microsoft Store - Microsoft Q&A
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I PURCHASED A UPGRADE TO WINDOWS 11 PRO THROUGH MICROSOFT STORE, HOW CAN I UPGRADE MY OS FROM WIN 11 HOME SINGLE LANGUAGE TO WIN 11 PRO
Please see the accepted answer in the following thread.
Upgrade from Windows 11 Home Single Language to Windows 11 Pro via Microsoft Store - Microsoft Q&A
AI answer
Sign in to Windows and Microsoft Store with the Microsoft account used to purchase the Windows 11 Pro upgrade, open the purchased upgrade in Microsoft Store, and select Install.
A Pro upgrade purchased through the Microsoft Store app uses a digital license associated with the purchasing Microsoft account; activation should occur after the PC is online and signed in with that account.^1^
Use the following edition-change procedure:
VK7JG-NPHTM-C97JM-9MPGT-3V66TThe generic key only changes the installed edition to Pro; it is not an activation license. Your purchased Microsoft Store digital license performs activation afterward.
If the Activation page displays Troubleshoot, Windows is currently unactivated:
The troubleshooter requires an administrator account, and its Troubleshoot option appears only while Windows is not activated.^3^
If activation still fails, use Microsoft customer support from the same activation-troubleshooter page and keep the Store purchase confirmation available.
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