Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Dear respected Frank Fan3,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, it seems that you are trying to active Windows with your Office 365 business trial account.
If my understanding is right, we'd recommend you try to post this question inMicrosoft Q&A Community, which is a dedicated channel handling Windows activation queries. The engineers in related team will focus on your specific scenario and provide specific suggestions.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad