Q. When trying to sign in to Microsoft 365 Copilot, they receive an error message.
Error: Another account from your organization is already signed in on this computer. Try again with a different account.
A. There may be a problem with the Microsoft 365 Apps for enterprise license activation.
*From January 2025, the name "Microsoft 365" was changed to "Microsoft 365 Copilot".
Please refer to the article below and reset the sign-in information for your Office applications.
Reference: Error "Something Went Wrong" signing in to Microsoft 365 Copilot.