Vugen failing to record HTTPS traffic even though certificates installed.

I have been attempting to record a HTTPS url. Initially when I attempted to record the traffic, I was hit with this error:-

VuGen has detected that the application has encountered the following error:
The SSL Authentication Failed. Try adjusting the Port Mapping settings (Recording Options>Network>Mapping and Filtering)

I tried to do this various ways. 

1. I switched the auto detect off for SSL - THIS FAILED
2. I chose a specific encryption type that I know to be ours - TLS1.3, this failed.
3. I turned off the two options. This failed to pick up any traffic


Currently this is very frustrating and I do not know why this is failing. 

Can someone please help.