Official documentation checked October 14, 2026. If Copilot in PowerPoint stays on “Initializing,” start by finding out whether the failure affects one presentation, the desktop app, or the account across devices. The spinner alone does not identify a broken license cache or prove that a particular Microsoft Graph request failed. This guide covers PowerPoint for … Read more
Official documentation checked October 14, 2026. AADSTS50158 means an external security challenge is involved in the sign-in flow. It can appear when the user is redirected to terms of use or an external authentication provider. Importantly, the code alone does not prove that the overall sign-in failed. Do not start by excluding Copilot from Conditional … Read more
Official documentation checked October 14, 2026. If Copilot begins reporting invalid_grant after a work-account password reset, first try a fresh sign-in in the affected application. A revoked or stale refresh token is one possible cause, but the error does not prove that every Microsoft 365 cache needs deleting. Save your work before signing out. Do … Read more
Official documentation checked October 14, 2026. If Microsoft 365 Copilot fails only while a corporate VPN is connected, the network path is a useful lead, not a complete diagnosis. DNS, routing, proxy authentication, TLS inspection, blocked WebSockets, and access policy can produce similar symptoms. Keep the managed VPN and security configuration intact while collecting evidence. … Read more
Official documentation checked October 14, 2026. A Copilot sign-in failure on Windows 11 is not automatically a Web Account Manager (WAM) failure. First identify the app, account type and full error. In particular, do not disconnect a managed work account or remove all Microsoft accounts just because a sign-in window says “Something went wrong.” 1. … 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
Official documentation checked October 14, 2026. A “region not supported” message in Copilot does not establish that an EU tenant must disable its data protections. Copilot supports EU organizational use, while particular features, models, clouds, and rollout stages can have different availability. Do not change the tenant’s country, disable governance controls, or run Teams location … 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
Official documentation checked October 14, 2026. If a Copilot window freezes or closes and the failure mentions msedgewebview2.exe, investigate the WebView2 runtime and the app hosting it. A blank pane alone is not proof of a runtime crash. Keep antivirus, firewall and Memory Integrity enabled while you establish what actually failed. Identify the app and … Read more