This is for Active Directory Federation Services / "AD FS" / ADFS on Windows Server 2016 (currently Technical Preview 2).
My server is in an Azure VM.
I been playing around with Postman and the new OpenID Connect / OAuth2 features in ADFS.
But could not get it to work.
I contacted the Postman people who were very helpful and they advised me that the issue was that the SSL certificate on my VM is self-signed and hence causes the problem. There's no trust. Other than that, there appears to be no issues.
As this is a test VM and is going to be superseded when TP3 comes along, I don't really see any point in paying for a CA certificate.
But it would be nice to see it working :-)