how to fix server can't find app.local: NXDOMAIN when nslookup

Question

thea [ ~ ]$ nslookup app.theachen.local

Server: 168.63.129.16

Address: 168.63.129.16#53

** server can't find app.theachen.local: NXDOMAIN
I have created an Azure Private DNS zone (theachen.local) and added an A record (app.theachen.local with IP 10.1.0.4). However, when I try to resolve the domain using nslookup, get the error:

sh
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** server can't find app.theachen.local: NXDOMAIN