Hi,
Have been testing Online Activation using the 2023 BETA. I found that unless I reset PHP 8.xxx back to PHP 7.xxx, it would not work at all. There appears to still be other problems when I have tested, especially populating the DB with a new test user after they have completed a test purchase. But, just in case your PHP setting is 8.xxx, try your tests with PHP 7.xxx. Maybe it could help?