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I have successfully generate my SSL certificate. But, maybe I missed one thing when I setup this.
I ran this command "sudo certbot --apache -d merchantbay.com -d merchantbay.com"
Now, I can't access the site using www and it's showing error message.
I might be missing something, but why would you enter the same hostname twice on the command line? This note towards the double identical hostname without a www subdomain might also hint you towards how you could add the www subdomain to your certificate