Product: Nintex Forms for Office 365
The following message appears in Internet Explorer when a Nintex Form is expected.
"This content cannot be displayed in a frame"
For example, if the upload function in a SharePoint library is configured to display a Nintex Form, selecting that function displays the above error message instead.
Internet Explorer does not trust the external domain used to display the form (Nintex.com).
Add Nintex.com to trusted sites. For instructions, see the Microsoft article Security zones: adding or removing websites.