Geoportal 1.2.9 and Portal for arcgis 10.5.1 integration

[sboutard]

Hello,
I want to configure my geoportal with my portal identity store.
When I click on the geoportal connect link, i can see and authenticate me with the portal form. But, when i define my user/password i'am never connected to my geoportal...
All is ok if i use my arcgisonline profil.

For my portal, i use : authorizeUrl="https://mylocalportal/portal/sharing/rest/oauth2/authorize"
For test with arcgisonline, i use : authorizeUrl="https://myagol.maps.arcgis.com/sharing/oauth2/authorize"

thank you for your help !