macOS not resolving IP Address
Sounds like the updated DNS info hasn't propagated to the DNS server your macbook is using. 

If you have access to the DNS's TTL settings, set it to some low number of seconds should speed up propagation before you change the IP it points to.

More info here - https://stackoverflow.com/questions/21091321/how-to-force-dns-refresh-for-a-website?utm_medium=organic&amp;utm_source=google_rich_qa&amp;utm_campaign=google_rich_qa