Hey @ddb!
So first would try removing the Automox Service Account entirely using this command.
sudo dscl . -delete /Users/_automoxserviceaccount
Then try the process of passing it again.
Something to note is that if you have any MDM rules that rotate passwords this would interfere with the Service Account and break the password. You would need to exclude the account from rotating.
For the Worklet I would review the readme text in the to ensure its been configured properly. If the variables are input incorrectly or fail it will attempt to use the currently logged in user to grant the secure token causing the prompt to the end user.
Hopefully that helps! If not I would recommend submitting a support ticket so we can triage further.
Have a great day!