/token end-point authentication failing

[AshokChava]

I am seeing the following error when I try to have oauth flow for an MCP server in my MCPO and I have tried all possible token_endpoint_auth_method but none seems to be working.

The same MCP server works fine with VSCode cline with oauth flow, so wondering if this is a bug in MCPO.

Following is my MCPO config:
{
"mcpServers": {
"m365/sharepoint": {
"type": "streamable_http",
"url": "http://localhost:8095/m365/sharepoint",
"oauth": {
"server_url": "http://localhost:8095",
"client_metadata": {
"token_endpoint_auth_method": "client_secret_basic"
}

    }

  }
}
}

Error:

2025-12-19 09:10:50,528 - ERROR - OAuth flow error
Traceback (most recent call last):
File "C:\Development\Python311\Lib\site-packages\mcp\client\auth\oauth2.py", line 587, in async_auth_flow
await self._handle_token_response(token_response)
File "C:\Development\Python311\Lib\site-packages\mcp\client\auth\oauth2.py", line 405, in _handle_token_response
raise OAuthTokenError(f"Token exchange failed ({response.status_code}): {body_text}") # pragma: no cover
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
mcp.client.auth.exceptions.OAuthTokenError: Token exchange failed (401): {"error":"unauthorized_client","error_description":"Client secret is required"}