If you were not prompted to add your Auth Key during your WordPress AtomChat Plugin installation, it is possible that the Basic Security features of AtomChat are not enabled.
Then perform these steps to enable Basic Security.
Once your plugin has been installed, click on the AtomChat Plugin
Add the Auth Key that you’ve copied-
Once you’ve added the Auth Key, visit the AtomChat Admin Panel and head over to Settings -> Authentication. Under Security, enable the “Enable Auth Key Verification?” setting.
Clear your browser cache and login to your WordPress site.
We strongly recommend switching off Guest chat feature in AtomChat Admin Panel.