www not working on clickfunnels pages

Hi, I am using GoDaddy domain, and have ClickFunnels pages within my WordPress website. Only the home page works if you add www into the web address.
All other ClickFunnels pages take me to the ClickFunnels 404 error page.

Any ideas? GoDaddy and ClickFunnels are unable to help.

Example (this is not my actual website)
https://mywebsite/privacy –works fine
https://www.mywebsite/privacy –goes to clickfunnels error 404 page