Distributed Collaboration Support

It would be highly beneficial if VSW could support authentication with distributed collaborations between AGOL/Portal. Currently, if I want my VSW app that is hosted in my portal to consume an item that is shared from my AGOL organization through a distributed collaboration, my users are prompted to input their AGOL credentials through a rudimentary un/pw dialogue box - not the traditional AGOL login screen. This means that my users have to have a separate AGOL login from their Windows credentials in order to login, even though our AGOL is setup to utilize SAML authentication. When I view the map through the Portal map builder, the SAML authentication works for the AGOL layers, but as soon as I go through VSW, the SAML no longer works.