I'd like to add a SharePoint Hosted Add-In from the AppCatalog to a SharePoint 2016 on-premises Website, but in the Site Contents of that Website the SharePoint Hosted Add-In is stuck being grey with the message "We're adding your app".

I have the SharePoint Environment Configured as described in SharePoint 2016 : A Deep Dive into SharePoint Add-in Environment Configuration and SharePoint Hosted Add-in Creation and Upgrade, I have checked the windows services and both SharePoint Administration and SharePoint Timer Service are running.

So, how can I get the SharePoint Add-In to be successfully added to the SharePoint Website?

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