Change nameserver in Siteground and website is showing 404 error

Hi, I am trying to use Cloudflare CDN service on my website, hosting by siteground, after I change the nameserver in siteground, my website shows 404 error. how can I fix it?
when I change the nameserver back to siteground, it seems normal again
thanks in advance

what is the name of the website?

www.vaperchoice.com.au

Thank you. You may want to verify the value of your DNS records with your hosting provider. The 404 comes from your origin server, cloudflare does not serve 404 errors. The error is a not found error, either the site is not at that location or the location/content of your DNS record is pointing to an incorrect location, details here,

A quick :search: on this site will show a lot of mentions of 404s,

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