Office 앱 설정을 위해 Microsoft 365에서 처리, 제품 키 사용 및 라이선스 활성화.
Hello Seungyoon L.
Thank you for reaching out to the Microsoft Community.
Try adding the account associated with your Microsoft subscription to the Windows PC you are trying to install Office 365 on and install using the user account.
Go to Settings > Accounts > select Family & other users. Select Add someone else to this PC.
Let me know if you need more help.
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Kind regards Eunice