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After the initial configuration of the outlook profile, at first start outlook is prefilling the user within the UPN / E-Mail Address. Check if this matches your authentication action on your ADC. In the password login window, switch to another option and test with for example samaccount name.

it´s configured for UPN and SAM: ..add authentication ldapAction LDAP_UPN -ldapLoginName userPrincipalName -ssoNameAttribute userPrincipalName add authentication ldapAction LDAP_SAM -ldapLoginName sAMAccountName -ssoNameAttribute sAMAccountName ..