I can log into lucidchart mcp in the copilot CLI but not in the app Authentic...

I can log into lucidchart mcp in the copilot CLI but not in the app Authentication failed
Lucid: RPC error -32603: Request session.mcp.oauth.login failed with message: failed to initialize MCP client: Send message error Transport [rmcp::transport::worker::WorkerTransport>] error: unexpected server response: HTTP 401 Unauthorized: {"error": "unauthorized", "error_description": "Invalid or expired access token"}, when send initialize request it will not let me

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| Field | Value |
| --- | --- |
| App version | 1.0.17 |
| OS | macOS 26.3.0 |
| Theme | Remedy Tilted |
| Path | /chat |
| Tenure | Week 8 |

Reproduce the LucidChart MCP OAuth login in app version 1.0.17 on macOS, comparing it with the working Copilot CLI flow. Start by tracing the app's MCP OAuth login and token handling until the initialize request returns HTTP 401, then verify that authentication completes without the invalid-or-expired-token error.

Written by the indexing model from the issue text.