Non public item in ArcGIS Portal can not be added to Map in Geoportal

[as0050629]

Describe the bug
ArcGIS Portal Non Public item can not be Added to Map in Geoportal

To Reproduce
Steps to reproduce the behavior:

1. Go to Portal for ArcGIS
2. Add an item.
3. Harvest this item in Geoportal'
4. Scroll to this item in Geoportal and Add to Map.
5. It opens Portal Sign In dialog. Enter valid credentials.
6. It fails with token error

Expected behavior
Item should be added Map

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[as0050629]

In troubleshooting session, we found that portal token service is not accessible from Geoportal machine due to Access Control Origin error

Access to XMLHttpRequest at 'https://solutions.esri.in/portal/sharing/generateToken' from origin 'http://desktop-39e9di7:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Please follow below link to allow Geoportal machine domain in Portal.
https://enterprise.arcgis.com/en/portal/latest/administer/windows/restrict-cross-domain-requests-to-your-portal.htm