Perhaps, it’s your permalink structure, try setting it similar to what you are using on your localhost.

You can also try creating a custom page template that is reusable.
https://premium.wpmudev.org/blog/creating-custom-page-templates-in-wordpress/
The custom page template can be selected in your page editing interface, and will work irregardless of your slug or permalink structure.

Thank you

But the problem is resolved! After a good night’s sleep I noticed there was one page-{slug} that was working. What was different about this page? It had a longer name. Yep. Apparently you can’t give your page a three letter name, ever, not any three letters, even if it doesn’t appear to conflict with other pages.

You are welcome. Thank you for your reply.
Glad to be of some help.