Official documentation checked October 14, 2026. If organizational Copilot asks you to sign in after Windows wakes or unlocks, record the exact error before changing anything. The timing does not prove that locking the screen revoked a token. A browser session, an app refresh token, and Windows single sign-on can fail for different reasons. 1. … Read more
When using Copilot in Microsoft 365, you may see error AADSTS90033. This error appears as a pop-up or in the Copilot pane with a message about a transient session problem. The error stops Copilot from generating responses, drafting documents, or analyzing data. The root cause is a temporary failure in the authentication token exchange between … Read more
You try to use Copilot in Microsoft 365 and see the error: Insufficient privileges to complete the operation. This error stops you from generating content, summarizing documents, or accessing Copilot features. The root cause is almost always a missing or misconfigured license, a user role that lacks the required permission, or a Conditional Access policy … Read more
You are running Copilot in Windows 10 version 22H2 and the Web Account Manager WAM plugin stops responding. This causes Copilot to freeze, show a blank screen, or fail to sign in after a system update. The WAM plugin handles authentication tokens for Microsoft services, and a hung state usually comes from a corrupted token … Read more
When you try to sign in to Copilot in Microsoft 365, you may see the error AADSTS50034 with the message “User account does not exist.” This error means the user account you are using is not found in the Azure Active Directory tenant that Copilot connects to. The root cause is often a mismatch between … Read more
When you open Copilot in Microsoft 365 for Mac on macOS Sequoia, the app may show the error “NSURLErrorDomain Code -1202” and fail to load. This error prevents Copilot from connecting to Microsoft servers, blocking all AI-powered features including draft, summarize, and chat. The root cause is a certificate validation failure introduced by macOS Sequoia’s … Read more
When you run Copilot in a hybrid Active Directory environment, you may see the error ‘NetBIOS Name Resolution Failed.’ This error stops Copilot from connecting to on-premises resources like file shares or domain controllers. The root cause is a mismatch between how Copilot resolves NetBIOS names and how your network handles name resolution. This article … Read more
When you try to sign in to Copilot in Microsoft 365, you may see the error message: AADSTS90014 Required Field Missing. This error means the authentication token sent to Microsoft Entra ID does not contain a required field, such as the audience, scope, or client ID. The root cause is often a misconfigured application registration, … Read more
Official documentation checked October 14, 2026. A TLS error around Copilot does not identify which machine needs a registry change. A browser, custom agent action, connector, gateway, reverse proxy, and backend API can each participate in different connections. Locate the failing connection before altering a shared server. Microsoft has deprecated TLS 1.0 and 1.1 for … Read more
You signed into Microsoft Edge for Business with your work account, but Copilot shows a generic welcome screen or returns responses that ignore your tenant data. The profile sync between Edge and Microsoft 365 has failed, so Copilot cannot confirm your identity or access your organization’s data. This problem usually occurs because the Edge profile … Read more