Next_items_page

Hi i Am trying to to call next_items_page in C# with graph API below string
string queryNextQuery = “{ "query": "” + @“{ next_items_page(cursor: “”” + cursorObj + “", limit: 2) { cursor items { id name } } }” + “" }”;

Its working in Monday API play ground but when we call from C# application its throw error
HTTP/1.1 500 Internal Server Error
Date: Fri, 30 Sept 2024 16:46:42 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
x-request-id: 1b0d73bf-b731-99b8-b1a0-0308cc78235e
x-runtime: 8.957594
x-envoy-upstream-service-time:…

Please Provide us Solution what we are missing .