Web Portal timeout duration vs RSTS authentication

Hi

My question concerns to Web portal session timeout.

In my use-case I had to setup a timeout session to 15 minutes.

I've followed this guideline https://support.oneidentity.com/identity-manager/kb/213794/how-to-increase-the-web-portal-timeout-duration which worked like a charm.

Then the use-case has been changed so I had to change authentication method to "OAuth 2.0/OpenID Connect (role based)". Note that I am using Redistributable Secure Token Server (RSTS) as OpenID Provider.

Since that change the session timeout doesn't work.

Can you please advise how to fix that?