claude-code - 💡(How to fix) Fix [BUG] Microsoft 365 MCP OAuth still fails with duplicate 'prompt' parameter (AADSTS9000411) — regression of #49175 [3 comments, 2 participants]

TL;DR

Remove the duplicate prompt parameter from the authorization URL to fix the Azure AD rejection.

Guidance

• Verify the current implementation of mcp__microsoft365__authenticate to identify where the duplicate prompt parameter is being added.
• Check if there's a configuration option to set the prompt parameter only once, ensuring it's either select_account or consent, but not both.
• Consider modifying the code to prioritize one prompt value over the other, or to remove the duplicate parameter before sending the request to Azure AD.
• Test the updated implementation to ensure the OAuth flow completes successfully.

Example

No code snippet is provided as the issue doesn't contain specific implementation details.

Notes

The fix relies on modifying the mcp__microsoft365__authenticate function or the underlying configuration to remove the duplicate prompt parameter.

Recommendation

Apply workaround: modify the mcp__microsoft365__authenticate function to emit only one prompt value, as this is a specific and targeted fix for the identified issue.