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This error has been brought up several times before, however this context is unique. I am aware that the following error:

'Error occurred in deployment step 'Install app for SharePoint': Sideloading of apps is not enabled on this site'

is usually shown when trying to deploy a SharePoint add-in to a non-development site. Strangely, I now receive this error message while deploying to a development site, a site I have used to debug apps for months. Does anyone know what might have changed to make this error appear, or where I can check the site type from the site settings?

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Side loading is controlled by the hidden feature EnableAppSideLoading, so you need Powershell access to check if the feature is enabled on the site collection (and enable it).

Here is a MSDN blog article on how to do it on Office 365.

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