WordPress site only works with 1.1.1.1 DNS, but client can’t view on other devices

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I made a demo site for a client that’s just a basic page + two redirects on the same website but it won’t load unless I manually configure my device DNS to [1.1.1.1])

I need to send it to a client but they can’t view the website as well. Is there a way to fix this without asking them to manually update the DNS? They’re not particularly tech-y and I fear this will be a problem on other devices as well.