Official documentation checked October 14, 2026. When Copilot immediately asks for authentication again after you complete sign-in, stop repeating the same challenge and capture what happens. The cause may be an account mismatch, a required device condition, an authentication-component fault, or a service problem. The loop itself does not prove that Office credentials are corrupt, … Read more
The Copilot pane in Microsoft 365 apps like Word, Excel, and Teams repeatedly asks you to sign in again, even when you are already authenticated. This loop prevents you from using Copilot features such as drafting documents or summarizing emails. The primary cause is a corrupted or expired authentication token that Microsoft 365 cannot refresh … Read more
You open Copilot Chat on a Microsoft 365 work or school account, but the interface shows Personal Mode with a consumer account icon and no access to work files or enterprise data. This prevents you from using Copilot with Microsoft Graph, Teams, or SharePoint context. The cause is typically a misconfigured Microsoft 365 tenant setting … Read more
You are signed into Copilot Chat with your personal Microsoft account, but the option to switch to your work or school account is missing or grayed out. This problem typically occurs when Microsoft 365 authentication policies, browser cache, or the Copilot app configuration block the account picker from loading correctly. The root cause is often … Read more
When you open Copilot Chat in Microsoft Teams, Edge, or the standalone copilot.microsoft.com site, you may see the error message “This account is not supported.” This message blocks you from sending any prompts or accessing Copilot features. The root cause is typically a licensing mismatch, a conditional access policy, or an account type that Microsoft … Read more