After i published app (not sure if related) to app o365 catalog (not store) i cannot debug app installed (or uninstalling) receivers using azure service bus anymore. I even tried removing remote endpoints from app manifest, but it did not help.
I also needed to increment app version in manifest to be able to event attempt debugging as app with same version was already in app catalog.
This is what is in output window
Successfully installed app for SharePoint. Services/AppEventReceiver.svc has been registered on Windows Azure Service Bus successfully. Services/AppEventReceiver.svc has been registered on Windows Azure Service Bus successfully.
Enable debugging via Windows Azure Service Bus is checked in project settings. Connection string to Azure Service Bus is provided. I created Service using powershell so it does support necessary authentication methods. Related web project is also set up in app project properties. Debugging using service bus worked for me on this project before.