SAML based SSO in context of NWBC 4.0 Desktop

I setup NWBC to SSO via SAML2 (OKTA as - Identity provider) with the help of my infrastructure team.

The web html version of NWBC via IE works absolutely fine including HTTP & HTTPS (with suggestions from Samuli kaski on this forum)

However, the NWBC 4.0 PL12 desktop version, is having issues. When I try the SAP system's SICF service URL, https://<ABAP AS>:44301/nwbc in the connection settings, the NWBC screen goes through the SAML/IDP authentication succesfully and then just hangs with a blank screen. Confirmed via fiddler

Set the trace level to VERBOSE and couldnt find anything that made sense to me in the trace files. I also setup the parameter AllowTemporaryConnections to True in the NwbcOptions.xml.template file on my client side.

I checked the note # 1378659 - NWBC known issues & what to check when opening a ticket

The NWBC 4.0 PL12 is the latest version, backened SAP_BASIS version is at NW 7.31 SP09 & Windows version is Windows 7

Any suggestions on this issue? Thanks in advnace.

Thanks

Dhee