If you are going shopping for a TPM 2.0 module, here are some things to know

The TPM module that I ordered for the Asrock A320M-HDV rev4.0 came today and I started off by disabling the fTPM in the BIOS. Big mistake, I could only get it to go back into the BIOS from a cold start, no booting to Windows and ended up switching the fTPM back on.
The options in the BIOS were as follows:

AMD cpu fTPM (enabled or disabled)
Route to LPC TPM
disabled

My next step will be to leave the fTPM enabled and fit the TPM module and go back into the BIOS and select the second option. Before doing this, I will try to find out the meaning of LPC TPM.

The LPC stands for low pin count and TPM modules fit into this category. I eventually got things up and running, having to go to my Microsoft account to get the pin back up and running after monkying about with the security hardware. You can get away with entering the same pin as before with Microsoft. The TPM details have been updated in settings-security, the chip is an Infinion one now.
It took 12 days from China for the module to arrive, its about the same size as an SD card.