Verified access log - Access denied due to a missing cookie

{ "activity": "Access Denied", "activity_id": "2", "category_name": "Application Activity", "category_uid": "8", "class_name": "Access Logs", "class_uid": "208001", "device": null, "duration": "0.0", "end_time": "1668593568259", "time": "1668593568259", "http_request": { "http_method": "POST", "url": { "hostname": "hello.app.example.com", "path": "/dns-query", "port": 443, "scheme": "h2", "text": "https://hello.app.example.com:443/dns-query" }, "user_agent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML", "version": "HTTP/2.0" }, "http_response": { "code": 302 }, "identity": null, "message": "", "metadata": { "uid": "Root=1-5cf1c832-a565309ce20cc7dafEXAMPLE", "logged_time": 1668593776720, "version": "0.1", "product": { "name": "Verified Access", "vendor_name": "AWS" } }, "ref_time": "2022-11-16T10:12:48.259762Z", "proxy": { "ip": "192.168.34.167", "port": 443, "svc_name": "Verified Access", "uid": "vai-108ed7a672EXAMPLE" }, "severity": "Informational", "severity_id": "1", "src_endpoint": { "ip": "10.7.178.16", "port": "46246" }, "start_time": "1668593568258", "status_code": "200", "status_details": "Authentication Denied", "status_id": "2", "status": "Failure", "type_uid": "20800102", "type_name": "AccessLogs: Access Denied", "unmapped": null }

What could the reason of the error and how to fix it.