Ensure CB Auto Actions itself is public and published in CB > Plugin Management. Access there determines if CB Auto Actions will even load for someone. Next you'll just need to review your auto action as there wouldn't be any further checks that'd be applying. Provide screenshots of your auto action and can see if there's possible configuration issues in it.
Is there any information about auto action crashes?
CB Auto Actions encloses itself in try catches to prevent trigger behavior crashing your site. Enable debug mode and maximum error reporting in Joomla global configuration then in your auto action under the Parameters tab enable debugging. Next retry and if there's any debug info it will output it.