Microsoft is now rolling out its Copilot Pro subscription to all 222 markets where Copilot is already available. Starting today, Copilot Pro now includes Copilot in the free Office web apps, which can be found at office.com.

source https://www.windowscentral.com/microsoft/microsoft-brings-copilot-pro-to-more-markets-adds-copilot-to-free-office-web-apps