Hello,
The first thing I would check is your cron job. Make sure the path to api/cron.php is still correct.
If that doesn’t resolve your issue there is lots of info related to troubleshooting osTicket / email fetching issues in the osTicket forum:
https://www.google.com/search?q=osticket+email+fetching+not+working
Keep in mind it is very unlikely this is an issue introduced by osTicket Awesome. In other words, if you’d upgraded to the latest version of vanilla osTicket — whatever the issue is — most likely you’d be experiencing it.
I point that out because there is no reason to limit your search for a solution to this forum.