Users may receive the following message when they try to add an iframe containing Application Workspace to SharePoint: “Embedding content from this website isn't allowed.”
Workaround:
Allow embedding content from a specific list of sites:
- Browse to the root site of your site collection.
- Click on the settings gear > click Site Information link > View all site settings.
- On the Site settings page, under Site Collection Administration, click HTML Field Security.
- Select one of the following options:
Allow contributors to insert iframes from any domain
Allow contributors to insert iframes only from the following domains (if you choose this option you need to add the Application Workspace URI to the list). - Click OK
