The certificate is not being verified. Why?

Question

Microsoft Exchange

Hello? Picked it up, Exchange 2016, installed a commercial wildcard certificate on it. When connecting clients, from mobile and other clients, both inside and outside, the certificate does not swear. Previously, with a self-signed certificate, there was a problem. Not now. But, when checking on testconnectivity.microsoft.com, an error appears: "The certificate chain didn't end in a trusted root"
Question why? Am I having problems somewhere, or is this a standard testconnectivity.microsoft.com glitch?

Answer 1

Can you show me the certificate? Komodo has such a jamb - they issue a certificate not in the root CA, but in some intermediate one, but find the certificate of this intermediate one yourself :)