404 Page does not exist when using (www)

Hi all. New here. Need some help.
Ive signed up my domain with cloudfare. Ive changed the name servers to cloudfare.
When i type my domain without (www) all is perfect with the green lock.
When i type my domain with www.mydomain… i get 404 Page does not exist.
It does though say https://www.mydomain
When i delete Cloudfare server names, and restore the original server names, Both with or without the (www) works fine, But not secure.
Any one with any guidance please?

You were probably missing the A record for www. Also, when changing nameservers, you must allow time (could be several hours) for them to propagate. Use this tool to check. https://dnschecker.org/#NS/

Thank you so much. Ive added record A and it is working. :slight_smile:

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