Error message: (407) Proxy authentication required

There are two explanations for why the error message reading '(407) Proxy authentication required' will appear. 

1. Templafy Updater can't update local Templafy apps.

If this is the cause, find the Templafy Updater configuration file here:

C:\Program Files (x86)\Templafy\Templafy Updater\app.config

Add the following configuration setting to app.config:

2. The user can't manually add content from Templafy asset libraries.

If this is the cause, find the add-in configuration files here:

C:\ProgramData\OfficeExtensions\Common\Addin\OfficeExtensions.Alloy.PowerPoint.dll.config
C:\ProgramData\OfficeExtensions\Common\Addin\OfficeExtensions.Alloy.Outlook.dll.config
C:\ProgramData\OfficeExtensions\Common\Addin\OfficeExtensions.Alloy.Word.dll.config
C:\ProgramData\OfficeExtensions\Common\Addin\OfficeExtensions.Alloy.Excel.dll.config 

Add the following configuration setting to the XML files: