API regression: BadRequest error on /beta/copilot aiInsights endpoint after 2025/09/22

Problem

The following API endpoint stopped working as expected after 2025/09/22:

https://graph.microsoft.com/beta/copilot/users/:user_id/onlineMeetings/:meeting_id/aiInsights

After 2025/09/22, requests now return:

{
    "error": {
        "code": "BadRequest",
        "message": "Value cannot be null. (Parameter 's')",
        "innerError": {
            "date": "2025-09-25T02:21:05",
            "request-id": "8e2a3b90-24ac-4a05-ad77-50d3ade65aba",
            "client-request-id": "8e2a3b90-24ac-4a05-ad77-50d3ade65aba"
        }
    }
}

# My code snippet:
graph_client = get_graph_client_beta(auth_code)
me = await graph_client.me().get()
user_id = me.id
graph_client.request_adapter.base_url = "https://graph.microsoft.com/beta/copilot"

query_params = AiInsightsRequestBuilder.AiInsightsRequestBuilderGetQueryParameters(
    filter=f"contentCorrelationId eq '{correlation_id}'"
)
request_configuration = RequestConfiguration(query_parameters=query_params)

result = await graph_client.users.by_user_id(user_id).online_meetings. \
    by_online_meeting_id(meeting_id) \
    .ai_insights. \
    get(request_configuration=request_configuration)

Impact

• This appears to be an API issue rather than an SDK bug, but it directly affects SDK behavior.
• The same code worked until 2025/09/22, so this looks like a regression in the API backend.

Request

• If this is an expected change, please update the documentation and communicate any required migration steps for SDK usage.

Start by reproducing the request against the beta /copilot/users/:user_id/onlineMeetings/:meeting_id/aiInsights endpoint with the shown Python SDK code and filter. Compare behavior before and after 2025/09/22 if possible, then determine whether the API contract changed and whether migration documentation is required.