I build an SharePoint 2013 Sandbox Event Receiver which works in my local on-prem dev environment. However, when pushing it up to my SharePoint Online tenant it does not work nor even fire at all.
I can see the event receiver attaching and detaching from my list using the SharePoint Client Browser for SharePoint 2010 and 2013 with each activation/deactivation so I know it is attaching properly.
Are there any special configurations necessary for it to work on SPOnline? Thanks