What problem does it solve? Microsoft 365 integrations fail in many ways — expired MCP auth tokens, stale Teams caches, broken SharePoint downloads, DRM-wrapped files, and Playwright session issues. This Skill provides systematic troubleshooting runbooks so failures get diagnosed and fixed before escalating to the user. ## Core Features & Use Cases - Eight Targeted Runbooks: Covers MCP authentication failures, Graph API message ID encoding errors, Teams cache staleness, SharePoint download failures, DRM/encrypted file handling, Classic vs. New Outlook conflicts, Playwright session issues, and Teams Monitor PTY failures on macOS. - Diagnostic-First Approach: Each runbook starts with concrete diagnostic commands (process checks, cache status, file header inspection) before prescribing resolutions. - Use Case: When a user reports "Teams isn't working" or an email send fails with a Graph API error, follow the relevant runbook to check the MCP server process, refresh the Teams cache, or fall back to the Outlook COM script — resolving the issue without user escalation. ## Quick Start Troubleshoot why my Teams messages are failing and fix the underlying M365 integration issue.