Is it supported to build and deploy a provider hosted app where the web site is hosted locally, and the app is deployed to SharePoint Online? The docs suggest that provider hosted apps can be hosted anywhere, but I can only find a couple scenarios actually documented:
1. SharePoint Online --> Azure hosted app
2. SharePoint on-prem --> on-prem app OR Azure hosted app.
If it is supported, could you also explain how authentication for external users with O365 accounts but without domain accounts would be supported in this scenario?
Mike G.