CB Not allowing registration

I have done what you recommended the menu item in the url on the registration page is CB-registration page

index.php?option=com_comprofiler&view=registers&Itemid=2286

The login menu it tries to redirect to is the CB-login page, both of these pages are published and accessible to the public, after return in the link below is a string of letters and numbers.

index.php?option=com_comprofiler&view=login&Itemid=2287&return=

I have tried changing the template just in case the template was hiding the error message, this is the message it displays after it redirects to the login page.

what makes no sense is the fact that both of these fields are available on the registration page, and I complete them each time.

The string "Please complete the username and password fields." doesn't exist in CB, Joomla 3, or Joomla 4. Likely something installed that's acting on Joomla user store. Since you're replacing EasyProfiles have you completely disabled it? Usually when this happens it's a 3rd party user plugin in Extensions > Plugin.