Le Chat Custom MCP connector with OAuth erroring; working in Claude and GPT

[tribal ridge]

I have a custom MCP with OAuth that is functioning on both GPT and Claude but giving me internal server errors when trying to connect with Le Chat.

{
"error": {
"message": "{"detail":"Auth setup to the integration at https://mcp.onfabric.io/mcp failed: Client error '400 Bad Request' for url 'https://mcp.onfabric.io/register'\nFor more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/400\"}",
"code": -32603,
"data": {
"code": "INTERNAL_SERVER_ERROR",
"httpStatus": 500,
"path": "integrations.create",
"zodError": null
}
}
}

is this a known issue? could someone give a hand?

[lone slate]

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