Newer MK7s Have longer CAN Messages which the older Hex+CAN VCDS hardware cannot support. You'll need a newer Hex-Net or HexNetv2 in order to fully communicate with newer modules, especially on 7.5s.
The software limitation for VCDS is for '19s as far as I can tell, so your Hex+Can might be able to work for some functions. I know my hex+can couldn't access everything on my '17, so Upgraded via their trade in program.
It is not the hex can. Micro is a different cable. Their product page does list mk 7 but i am not sure if its fully compatible with 7.5. It does say 2019+ is not compatible. I posted in case anyone has one and can confirm with a 2018.