I’m not super familiar with Apache (nginx user), however…! I’ll try to mitigate some common mistakes.

Do you know what kind of redirect you’re getting? As long as your DNS records are correct (A for Ipv4 and AAAA for Ipv6) and not using any redirects on the DNS record then it’s an Apache server or WP settings problem. You should try to nail down if it’s actually Apache or WP that’s doing this as it’s easier to help then.

Also, if you got a permanent redirect, clearing cache is important as the web browser might be remembering your previous settings even if you change them on the server side.