You open PowerPoint to use Copilot for creating slides, but the Copilot pane shows a spinning wheel and the message “Initializing” that never goes away. This usually happens because the Copilot service is waiting for a required dependency such as network authentication, a Microsoft 365 license check, or a local cache file that has become … Read more
When you try to sign in to Copilot in Microsoft 365, you may see the error message AADSTS50158 External Security Challenge. This error means that Azure Active Directory could not complete an external authentication challenge that your tenant requires. This is not a Copilot bug. It is a conditional access policy or identity protection rule … Read more
You reset your Microsoft 365 password, and now Copilot shows an “Invalid Grant” error when you try to use it. This error appears in the Copilot pane, in Microsoft Teams, or in the Copilot mobile app. The problem occurs because your cached authentication token is no longer valid after the password change. This article explains … Read more
When you connect to your corporate VPN and try to use Copilot in Microsoft 365, you may see a red error banner that says “Network Unreachable.” This happens because Copilot requires direct HTTPS access to specific Microsoft endpoints, and many corporate VPNs route traffic through restrictive proxies or block certain domains. The error can appear … Read more
When you launch Copilot on Windows 11, you may see an error message about the Web Account Manager Broker. This error prevents Copilot from signing in or responding to your queries. The root cause is a corrupted or misconfigured WAM component that handles authentication between Windows and Microsoft services. This article explains why the WAM … Read more
If you see a “TLS Handshake Failed” error when trying to use Copilot in Microsoft 365 apps on an older Windows client, your connection is being blocked before Copilot can respond. This error means the secure communication channel between your device and Microsoft servers could not be established. The root cause is almost always an … Read more
When you use Copilot in Microsoft 365, you may see the error AADSTS9002313 with the message Invalid Request. This error stops Copilot from generating responses, drafting documents, or accessing your data. The cause is almost always a malformed authentication token or a mismatch in the token request parameters sent by the client app to Azure … Read more
Users in European Union tenants sometimes see a “Region Not Supported” error when trying to use Copilot in Microsoft 365 apps. This block occurs even when the organization has the correct Copilot license assigned. The error is caused by a data residency setting that restricts Copilot services to a specific geographic region. This article explains … Read more
When you use Copilot in Microsoft 365, you may see an HTTP 451 error. This error means Copilot cannot access certain data because of legal or policy restrictions. The number 451 refers to the HTTP status code for content blocked by law. This article explains why this error occurs and how to resolve it for … Read more
Copilot in Windows 11 and Microsoft 365 apps relies on the Edge WebView2 runtime to render interactive responses. When this runtime crashes, the Copilot pane freezes, turns gray, or shows a message that Copilot is unavailable. The crash occurs because the runtime process becomes corrupted, outdated, or conflicts with system-level memory or security settings. This … Read more