Configuring User Session Count Limiter

Hi,
I’m trying to configure my server to only allow one active session. I added the “User session count limiter” step, and configured it to only allow one session per realm. Once I configure it, when I use two different browsers, everythings works fine as if it’s not configured, but when I try to open a new tab in the same browser, the new tab just shows a white page. My configuration is in the attached photo.

I’m using Keycloak 19.

Thanks for your help.