Subscriptions are not creating in the report server database

Question

I have written the code to create the subscriptions by adding the reference to ReportService2010.asmx. Please see the below screenshot for code and result [Id = 218, Status = WaitingForActivation, Method = "{null}", Result = "{Not yet computed}"]. I am not getting any error, but subscriptions are not creating in the DB.

I have configured the report server correctly by using the Report Server Configuration Manager. Reports are rendering correctly using the report server and entries of logs are creating in the table 'ExecutionLogStorage' of ReportServer DB.

Code:

ReportingService2010SoapClient rs = new ReportingService2010SoapClient(EndpointConfiguration.ReportingService2010Soap);

string report = "http://servername/ReportServer/Myreports/MyRDL";

System.Threading.Tasks.Task subscriptionID;

subscriptionID = rs.CreateSubscriptionAsync(new TrustedUserHeader(),report, extSettings, description, eventType, matchData, parameters);

Result of web service

I have used VS 2022, Framework 6.0, .net core. Microsoft SQL Server 2019

Web Service Reference

Please let me know if missed anything. Thanks in advance.