I’m trying to reproduce this in order to see if there’s a way to troubleshoot it. If you’re still experiencing this issue, could you please let me know how to best replicate this? I understand you’re on WP 5.3.2, and upgraded from Auth0 WP plugin 3.11.3 to v4.0 and CORS started to popup in the console. There’s also WooCommerce plugin installed, and you’re using embedded login. Any additional details and specifics would be greatly appreciated.
Also, if you have specific concerns with migrating to new Universal Login experience, I’d be happy to address them!