Why can't I substitute/cast my Derived Class to it's generic Base Class

Question

New coder here I have the following base interfaces:

public interface ITDXInput
{

}

Which fathers this one:

public interface ITDXInput <TSCContext, TContext, TWaferContainer> : ITDXInput where TContext : IToolContext where TSCContext: ISCContext where TWaferContainer : IWaferContainer
{
    TSCContext SCContext { get; set; }
    TContext ToolContext { get; set; }
    TWaferContainer WaferContainer { get; set; }
}

This interface then fathers this one:

public class CIMTDXInput : ITDXInput<CIMSCContext, CIMToolContext, CIMWaferContainer>
{
    public CIMWaferContainer WaferContainer { get; set; }
    public CIMSCContext SCContext { get; set; }
    public CIMToolContext ToolContext { get; set; }
}

It's members are like so:

public class CIMSCContext : ISCContext
{
    public string PROCESSING_END_TIME { get; set; }
    public string PRODUCT_NAME { get; set; }
    public string QUANTITY_IN { get; set; }
    public string LOT_OWNER { get; set; }
    public string FW_VERSION { get; set; }
 
}

public class CIMToolContext : IToolContext
{
    public string LOT { get; set; }
    public string TDX_MULTI_FILES { get; set; }
    public string PROCESSING_START_TIME { get; set; }
    public string WITHIN_UNIT_AXIS_DIRECTION { get; set; }
}

public class CIMWaferContainer : IWaferContainer
{
    public CIMWaferContext WaferContext = new CIMWaferContext();
    public List<CIMWaferImage> ImageList = new List<CIMWaferImage>();
    public List<CIMWaferDieResults> WaferResultList = new List<CIMWaferDieResults>();

}

But when I try to call the class like so:

public class TDXParser
{
    
    public ITDXInput<ISCContext, IToolContext , IWaferContainer> TDXInput  { get; set; } 

    public IEnumerable<IKlarfDefectList> KlarfDefectList  { get; set; } 

    //some code
    public virtual void WriteKlarf (ITDXInput<ISCContext, IToolContext, IWaferContainer> input, IEnumerable<IKlarfDefectList> defectList) 
    {

        if (File.Exists(TemplatefilePath) && File.Exists(InputfilePath))
        {
            TDXInput = input;
            KlarfDefectList = defectList;
            //some more code
        }
    }
}

The function WriteKlarf is called here:

CIMParser ParserObj = new CIMParser(item, fileName, ParserConfigFilesConstants.CIMTemplateFilePath);
ParserObj.WriteKlarf(input, klarfDefectList);

But Visual studio tells me

Error   CS1503  Argument 1: cannot convert from 'TDXXMLParser.Entity.CIM.CIMTDXInput' to 'TDXXMLParser.Entity.ITDXInput<TDXXMLParser.Entity.ISCContext, TDXXMLParser.Entity.IToolContext, TDXXMLParser.Entity.IWaferContainer>' TDXXMLParser    C:\src\tdx2klarf\TDXXMLParser\TDXXMLParser\Helper\CIM\CIMConversionHelper.cs

I then tried to cast like so:

CIMParser ParserObj = new CIMParser(item, fileName, ParserConfigFilesConstants.CIMTemplateFilePath);
ParserObj.WriteKlarf((ITDXInput<ISCContext, IToolContext, IWaferContainer>)input, klarfDefectList);

But at run time I get the error:

System.InvalidCastException: Unable to cast object of type 'TDXXMLParser.Entity.CIM.CIMTDXInput' to type 'TDXXMLParser.Entity.ITDXInput`3[TDXXMLParser.Entity.ISCContext,TDXXMLParser.Entity.IToolContext,TDXXMLParser.Entity.IWaferContainer]'.

Why is this happening? My CIMTDXInput inherits directly from it's generic interface parent