Currently Universal ZTNA will
                authenticate user certificates using one of two specific formats. Use this task to
                select the client certificate attribute that Universal ZTNA should examine to detect the
                username (an email address).
        
        - 
                Go to .
            
 - 
                From the Certificate Attribute for
                        Username field, select one of the three options:
                
                    
Note   
Universal ZTNA expects the Username to
                        be an email address or a User Principal Name (UPN). Other values will be
                        rejected.
 
                    
                        - Subject Distinguished
                            Name | Common Name - The Subject field of
                            the certificate the CN or Common
                                Name must contain the full email address of the client.
 
                        - SAN | Email Address - The
                                SAN or Subject Alternative
                                Name must contain either an email attribute, or that attribute
                            must contain the full email address of the client.
 
                        - SAN | User Principal Name
                            - The UPN must be the user‘s complete email address.
 
                    
                 
             - 
                If the username cannot be
                    determined by the Matching Criteria, define the action to be performed. In Universal ZTNA you can select the Reject Authentication
                        Request or leverage the username value from the RADIUS Request
                    and select Match with RADIUS Username.
            
 - 
                Select Update.
            
 
        Once you have matched the client
            criteria, go to Connect with OCSP Responder.