Access Denied - Global VGS Web App with Secured Webmap

I have a scenario where we are letting users from another org into our AGOL group as members of a group. Our webmap, workflows, print products are all shared to this group. The VGS app consumes these. The users outside the org cannot access the VGS web app and get this error

The web traffic says there was a fatal error and the app failed to init. We have tried making the VGS app global, but keeping the sensitive webmap and tools secure to the group only, and not global. If I make just a WAB app, the external can see the app and webmap. The main diff is the url. The VGS app is like apps like https://apps.vertigisstudio.com/ where as the WAB is org specific like https://[org].arcgis.com.../apps/webappviewer/... Any ideas from anyone? Is what I am intending on doing possible? I feel like the end user using VGS Web cannot access because their org is not licensed to use the VGS software and therefore not registered.