...
The Web SSO logon procedure will be used in logins from web browsers as wel well as logins from Office desktop clients that support modern authentication. On the other hand, the Enhanced Client logon procedure will be used by client applications that do not support modern authentications, such as some old versions of Outlook, and some third-party mail clients such as Thunderbird, Apple Mail, and Android Mail.
...
The logon procedure for the Enhanced Client must include only one logon step, and the logon step must include the Static Password only as the authentication method.
...