It may be helpful to enable debug level logs for a specific user while trouble shooting issues in Rules Engine.    

1. Obtain the user's details for whom you need to enable debug level logging.

  1. Navigate to Setup > Debug Logs > New.
  1. Select the user who authorized MDA, and select the debug level as SFDC_DevConsole (which will be available by default).
  1. Save the configuration and execute the rule which is causing the issue in live mode. You can find the debug logs which was created corresponding to the user.