Unable to select TYPE as MAIL in the login object
Screenshot for reference:
Release : 12.3.0 and 12.3.1 Automation Engine
This is a known issue in version 12.3.0 and 12.3.1 of Automation Engine.
To resolve the error, Kindly upgrade to Automation Engine 12.3.3 or any higher version or to any latest version available.
Workaround: Manually write MAIL under TYPE and save the object. Below is the screenshot attached for reference.