COM library failing to register in .NET Core


I am working with some COM libraries which allow me to connect to the IBM PCOMM API. I am trying to obtain a list of connections, from an object called AutConnList(). The code looks like this:

using AutConnListTypeLibrary;
using AutOIATypeLibrary;
using AutPSTypeLibrary;

public static List<string> GetSessions()
    var sessions = new List<string>();

    AutConnList connectionList = new AutConnList();

    for (int i = 1; i <= connectionList.Count; i++)
        IAutConnInfo sessionInfo = (IAutConnInfo)connectionList[i];

    return sessions;

I compile the code to both .NET Framework (4.6) and .NET Core (3.0) as it is intended as a library used by many different programs. The multi-compiling is done by adding the following line to the .csproj file:


The method works as intended, when consumed from .NET Framework applications, but when I try to consume it from .NET Core, I get the following exception:

Retrieving the COM class factory for component with CLSID {9DF30780-6F18-11D0-910D-0004AC3617E1} failed due to the following error: 80040154 Class not registered (0x80040154 (REGDB_E_CLASSNOTREG)).

I have tried solutions from different posts about similar issues (like this), but without luck. Also, I haven't found any other posts, where the problem only occurs in a specific framework.

I dont know if it has anything to do with the differences in referenced assemblies, but the error code doesn't really suggest that?

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Have anyone encountered similar issues, and if so, how did you solve it?


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