URL for addon domain

Hi, everyone.

I have moved an existing wordpress blog to a new host within an addon domain. I ran into a problem where directly entering the new domain name took me to the main domain instead.

With some searching here, I was able to locate a partial solution (thanks, everybody!). So now when I enter https://myaddondomain.com, everything’s fine, but https://www.myaddondomain.com still goes to the main domain (as does the subdomain address https://myaddondomain.mymaindomain.com). If I specify the index.php in the latter two addresses, I do pull up wordpress properly.

Any ideas what the problem is here?

Thanks!