lubos-h hi, I've forgotten to check it 😅. Anyway, I've just checked it now and I confirm that clicking the "New discussion" button when not logged in, redirects to the SSO login page.
wirtzdan This extension was born principally for a PHP auth systems. WordPress is a further implementation of the PHP plugin. However, I think you are able to use it with your JWT system. You need to make sure you send your JWT to {flarum_url}/sso/jwt
(replace {flarum_sso}
with your Flarum URL). Let me know if it works