Some people cannot get our DNS proxy

About 6-8 hours ago we tried moving over our domain name server to Cloudflare and proxying our existing DNS. All of the diagnostics come out positive and the site works for 98% of our visitors. However, a select few can now not access the site (it says website is unavailable) - for all devices on their network. We have had them refresh their local DNS but to no avail.

Is this normal for Cloudflare? Should we revert and give up?