How to load a OneNote add-in published to Azure Storage

Question

I have made a OneNote add-in, as specified here. All local tests were successful.

This project is a prototype for the development of a proprietary OneNote add-in for a client. Hence the add-in will not be published to the Office Store.

I will not be giving a development phase add-in for my clients so following Microsoft's publishing guide here, I have hosted the add-in as a Static Website on Azure. This process has provided me with a permanent link where the add-in will reside.

Using the guide provided by Microsoft, add-ins will be able to be loaded from a local manifest.xml file. but there is no input for loading the add-in from a url.

My question is, how can the client load the add-in from the link provided?