autodesk forge – three-legged authentication in Partner Card

How do I get three-legged authentication from inside My Dashboard Partner card (Project home on BIM360 or insights on ACC)?

I have an APS application than needs three-legged authentication.
I am trying to create a Partner card for my app.
The problem I have is when trying to get the authentication I need to redirect the user to auth.autodesk.com/ and then I get the error – “Refused to display ‘https://auth.autodesk.com/’ in a frame because it set ‘X-Frame-Options’ to ‘deny’.”.

What can I do to solve the issue?