Hello @db_1008
For trying to investigate the issue you have encountered, I have performed the following steps:
1. Opened the s32k3xx_sil_target_s32ct.slx file, delivered with the toolbox inside the following folder - {toolbox_installation_path}/S32K3_Examples/sil/s32k3xx_simple_s32ct
2. Right clicked the Simulink model canvas and chose Test Harness - Create for Model. In the opened Create Test Harness tab I have completed the Advanced Properties tab with the same settings as the ones you attached inside the SIL_Harness_Creation.png


3. When opening the harness model, and inspecting its properties, I am noticing that the model is created being set for the NXP S32K3xx.

4. Added inputs and outputs inside the harness for performing a SIL simulation

5. Set the Code Interface as Model Reference for the SIL block inside the harness model

6. From the SIL/PIL tab, I am able to successfully run an Automated Verification


Could you please let us know if this is the use case that you are trying to achieve, and check if these steps also work on your setup?
In case you are still encountering issues, could you also please help us with more details so that we could troubleshoot the problem? It would help us to know:
1. Is the model for which you are creating a harness already configured for an S32K3 hardware board?
2. What version of MBDT for S32K3 and MATLAB are you using?
Thank you,
Irina