V12 Enabling HTTPS on Local machine


This subject has been discussed here : https://community.aras.com/b/english/posts/setting-up-https-on-a-development-machine
But it looks not exaclty the same use case as I have.

I simply want to make my Aras Innovator V12SP9 working with HTTPS on my local machine (localhost).
So I use the IIS integrated certificate for localhost ("IIS Express Development Certificate").

But I get the following error and even after deeper researches I did not found how to solve it:

Obviouslt I've checked many time the installation and IIS configuration and everything is normally OK.
(actually It works fine with a V11SP15 except that I had to use TLS 1.1 instead of TLS 1.2)

Thank you in advance for yuour help