EB Start using the Engineering Base Ionterop

I'm working with EB 2023 in a 2 tier installation.
Client is a terminal server without EB App server
Server hosts the SQL- and EB's App server.

In my c# dot.net 4.8 application I have to start Engineering Base and then have to do something using the Engineering Base Interop API.

I can start EB manually using the start icon without any problems

If I use this code

using Aucotec.EngineeringBase.Interop;

...

IAucApplication ebApp = new Application()

ebApp.DoSomething();

I get this error message



Using this code

using Aucotec.EngineeringBase.Interop;

...

var process = new Process()

{

    StartInfo = new ProcessStartInfo(config.PathToEbExe),

};

process.Start();

process.WaitForInputIdle(config.WaitForInputIdleTimeout)



IAucApplication ebApp = new Application()

ebApp.DoSomething();

I don't get any messages, but because the EB UI (eg. the Tree) is not fully initialized I have troubles that some API commands do not work.


Question

• I guess, that the Interop uses different Windows credentials to start windows than process.Start() does.
  
But witch Windows Credentials are used when ebApp = new Application() starts Enginering Base? How can I figure that out?

• How can I avoid running in the error shown in the screenshot when starting EB using ebApp = new Application()?