Azure app insights api query problem

string workspaceId = "<redacted>";

var auth = new ClientSecretCredential("<redacted>", "<redacted>", "<redacted>");
var client = new LogsQueryClient(auth);

var response = await client.QueryWorkspaceAsync(
    workspaceId,
    "requests",
    new QueryTimeRange(TimeSpan.FromDays(1)));

Azure.RequestFailedException: 'The request had some invalid properties
Status: 400 (Bad Request)
ErrorCode: BadArgumentError

Content:
{"error":{"message":"The request had some invalid properties","code":"BadArgumentError","correlationId":"<redacted>","innererror":{"code":"SemanticError","message":"A semantic error occurred.","innererror":{"code":"SEM0100","message":"'where' operator: Failed to resolve table or column expression named 'requests'"}}}}