The problem seems to come from Windows. However, what you can do is open a terminal then type :
sudo os-prober
sudo grub-mkconfig -o /boot/grub/grub.cfg
Try to reboot and see what happens. If it doesn’t fix anything, then it might be that your Windows SSD should be mounted directly on the motherboard or, at the very least, on a USB-C port.
Sometimes, what happens is that the hub needs a driver which isn’t loaded by the DOS kernel by default. And since it isn’t loaded, Windows can’t recognise the hub so the hard drive containing itself can’t be found.
If that solution works, maybe you should swap your windows and your linux SSDs, see if the linux kernel can figure out the hub at boot.