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If you are having problems with all your users in your organization with this certificate you should check the name or names on it.<br />
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If you having this problem only with a new user on the organization, I will recommend you to start over the user profile and make sure the client is fully updated and the user information is entered in the format of DOMAIN\Username.
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If you are having problems with all your users in your organization with this certificate you should check the name or names on it.

If you having this problem only with a new user on the organization, I will recommend you to start over the user profile and make sure the client is fully updated and the user information is entered in the format of DOMAIN\Username.

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Since installing a 3rd party cert to exchange and Intermediary cert to root, Outlook is asking for a password when trying to connect a new client to Exchange 2013. The password is set in AD and works on OWA but will not connect in Outlook. Does the cert or some other permissions need to be changed in IIS?
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Since installing a 3rd party cert to exchange and Intermediary cert to root, Outlook is asking for a password when trying to connect a new client to Exchange 2013. The password is set in AD and works on OWA but will not connect in Outlook. Does the cert or some other permissions need to be changed in IIS?

If Autodiscovery is set in IIS and a single cert was present but an SSL CA cert has been added to exchange, does it need to be added in IIS as well?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

HTTPS is a protocol for secure communication over a computer network which is widely used on the Internet. HTTPS consists of communication over Hypertext Transfer Protocol (HTTP) within a connection encrypted by Transport Layer Security (TLS) or its predecessor, Secure Sockets Layer (SSL). The main motivation for HTTPS is authentication of the visited website and to protect the privacy and integrity of the exchanged data. HTTPS is widely used for protecting page authenticity on all types of websites, securing accounts and keeping user communications, identity and web browsing private.