Do you have the latest VBIOS?
Based on some reports [1], MSI GP73 Leopard 8 RF and possibly other MSI laptops [2], [3] needed a VBIOS update to work with the Oculus Rift S and the latest Nvidia drivers. This fix might apply to the Cosmos too.
Also the latest Nvidia drivers "Adds support for the HTC VIVE Cosmos VR HMD".
If you don't have the latest VBIOS, you will have to contact MSI support and ask them for it. There are many different laptop configurations so don't pick a random VBIOS flash from the internet.
PS: My forum nickname T was given to me automatically after first login with no option to change it even though I setup my InfinityTag and everything else in Viveport and can't find any other place where that nickname might have come.