Setup: M1 MacBook Pro, MacOs -- 15.4 (developer beta)
Issue: When trying to setup the extension the pop window comes up saying I need to be on the Sonoma or later. On the first attempt it will also display the input for the generated code (to link the keychain with the extension) saying that a pop up should show up on my mac displaying the code, however that code is never getting generated or popping up on my mac.

TL;DR the extension is confused saying I should be on Sonoma or later (which I am), and the key code is never being generated or popping up.