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Sideloading of apps is not enabled on this site

In order to publish a SharePoint App (Provider Hosted in my case) to a sitecollection it must be based on a developer site template or an App Catalog site template.
If you run into "Sideloading of apps is not enabled on this site" error when trying to publish the app the








Developer feature is most likely not activated.
The Developer feature is hidden so you have to activate it throug PowerShell.

Run the following script to activate the feature.

Enable-SPFeature e374875e-06b6-11e0-b0fa-57f5dfd72085 –url http://sharepoint.contoso.com

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