Hi @Uli D,
Please connect the product to an ASUS laptop, provide an overall connection diagram and open the display settings to see if the external display can be recognized (provide pictures)
Get and provide EDID, the steps are as follows: https://cdn.shopify.com/s/files/1/0667/3353/9632/files/EDID_Steps.docx?v=1735970435 (Note: Operation on ASUS laptop)
Looking forward to your reply.
Have a nice day.