Just having some trouble with Bypass CNA

The issue I'm facing is that when I connect to the captive portal, it redirects to the SSO login page. However, due to Apple's Captive Network Assistant (CNA), I'm unable to exit the portal and authenticate through SSO. If I try to do so, the session closes and gets stuck in a loop.
That's why I tried enabling the "Prevent CNA" option, but even after enabling it, Apple devices still open the captive portal in the CNA instead of the full/default browser.
Am I missing anything here ?
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