Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello SeeVang,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well.
Sorry for the inconvenience. However, you did not specify which Office license you have. If you have a perpetual license for 1-PC, you need to uninstall from original PC before installing on new PC.
If you tried activating and you receive the prompt that your license is already installed on a PC, kindly go to Microsoft Contact Us website:
http://support.office.com/home/chat
- Type "Activate Office" and click Get Help.
- Click Login and Contact Support at the bottom of the page.
- Log in with your Microsoft account.
- Under products and Services, select Microsoft 365 and Office Option.
- Under category, select "Activate my product"
- Click "Chat with a support agent".
Please let me know if you need more assistance.
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Warm Regards