Allowed characters that can be used in passwords for Automation Engine objects as well as in prompt sets
Automation Engine Version: 21.0.x and 24.0.x
The only special character " & " is prohibited from being used in automic passwords.
Since the automation engine script is overruled by it.
If you are using & as a character in the password, you will be seeing an error like below on the AWI on the details section for the particular object.
U00021719 Syntax error in object 'XXXXXXXXXX', line '00000'. 'U01001308 Variable '&****' has not yet been defined.'.