I have the same problem.
I have a domain added a domain domain.com to aapanel
After that to solve the problem I added another domain www.domain.com and redirected this domain to
https://domain.com
The redirection worked but we still have a third domain:
https://www.domain.com
This combination will not be redirected. It will be redirected to the index of the first website created on aapanel. Adding this code to .htaccess doesn’t solve the problem.

RewriteEngine On
RewriteCond %{SERVER_PORT} !443$
RewriteRule .* https://%{SERVER_NAME}%{REQUEST_URI} [R=301,L]
RewriteCond %{HTTP_HOST} www.domain.com$ [NC]
RewriteRule .*$ https://domain.com/$1 [R=301,L]

Thank you for the great script!
Do you have a solution for this problem?

    JAY same problem. When I open www version of my site it'll b open another site from aapanel

        v1sh4l
        This problem may be caused by your www.domain.com not deploying ssl but using https access

          aaPanel_Jose
          the same i was telling from day one. now domain is working on both www.domain.com and domain.com its not good for seo i want domain to open only on domain.com
          so i need to redirect from www.domain.com to domain.com. which is not happening from panel

              aapanel_user
              its working because your domain was registered as www.domian.com and this option may be removed as new redirect option is enabled.

                v1sh4l
                brother i know how to fix i can use htacess and CF and other ways iam trying to fix the one in panel.

                    JAY add www.yourdomain.com in domain manager of main domain

                    • JAY replied to this.

                        v1sh4l
                        do you understand what is title for this bug,
                        if i add www.domian.com in domain manager website open www.domain.com and domain.com

                          a month later

                          This problem is happening to me too, when accessing my blog https://meublog.com it works normal, more as stated in the browser https://www.meublog.com it does not work from the error. Why does this happen, and how to fix it ???

                          I confess that I even stopped using this panel because of this error? but now I'm back and I want to try to fix it, but how do you do it ???

                            joel
                            i reported many times and stopped asking about this and moved site to plesk

                                joel JAY
                                We will make improvements when we create the website, thanks for feedback

                                In addition, if you want users to redirect to domain.com when they visit www.domain.com, you can set it in the redirect function

                                1. add www.domain.com

                                2. Set redirection

                                    check how plesk hav option to create domain ..

                                    3 months later