Hello I just carried out a test and it works for me. I set up the plugin as per your situation. I created a new page for redirection. I made sure the page is not protected. Then I added the full URL to the following field After Registration Redirect URL. I then went to a different browser and carried out a free registration test. Once I completed filling in the registration form I was redirected to the page added to the following field After Registration Redirect URL. So I can confirm that it is working for me.
Testing site specs.
- PHP Version: 8.2.12
- Simple Membership version: 4.6.9
- WordPress version: 6.9
- Theme: Suffusion
Kind regards.