SEPM 14 Remote Push Stopped Working

I have SEPM setup on Window Server 2012 R2. This server has been in place for several years. When I first set it up I created a GPO to setup client computers with these settings:

https://support.symantec.com/en_US/article.HOWTO80805.html

Remote Push has worked fine for years, then a couple weeks ago I started having issues. When I try to use remote push it just states "Failed" under Deployment Status (I attached a screenshot of this). I have looked through Windows Event Viewer but can't find anything and don't know why this issue just started. I would appreciate any help with this.

Thanks,

Brian