With CA Automic Workload Automation Agents in version 12.1 a logon error is displayed although the Logon Credentials are correct.
Therefore no JOBS can be started with Logon Credentials containing passwords.
A connection outside of CA Automic Workload Automation is working with the identical Logon Credentials.
Update to a fix version listed below or a newer version if available.
Automation Engine 12.1.1 HF4 - already released
Automation Engine 12.1.2 - planned release date 2018-05-23