Customers can’t register

On the Registration Tab of settings – untick ‘Only users who have logged in can register’

Nope, I’m afraid that’s not doing it… if I tick that one, the registration form disappears and vice versa. but if I try to register while unticked, it comes to ‘please login to the admin area’

You will need to eliminate plugin an theme issues.

Deactivate all other plugins and switch to default theme.

Using the Health Check and Troubleshooting plugin makes this easy without impacting other users.

I can see what you have done

https://ibb.co/TrLFMkz

You have protected wp-admin with .htaccess but forgot to allow admin-ajax.php through.

This will break many plugins not just mine

You need something like

AuthType Basic
AuthName "Auth Required"
AuthUserFile /path/to/.htpasswd
Require valid-user
<Files admin-ajax.php>
  Order allow,deny
  Allow from all
  Satisfy any
</Files>

Hi Alan,
thank you for looking further into the problem.
Actually I have not characterized the authentification in my .htaccess-file so that’s not the solution either.

Do you have another idea?

Its definitely not a capability of this plugin to create a ‘basic auth’ login.

As suggested, eliminate other plugins one by one. Perhaps it is a security plugin or something your host or web developer has setup.

Sorry I can’t help you with that as it is not a plugin issue.

No worries – thank you for your quick and awesome support!