Create Subdomain

I have a website whitedotsports.com and I want to create a subdomain us.whitedotsports.com and for that, I created “A” Record with us and pointed it to my server IP address, still its not working.
Can anyone guide me on how to make it work?

Is this still an issue?

nslookup us.whitedotsports.com 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
Name: us.whitedotsports.com
Address: 104.31.68.41
Name: us.whitedotsports.com
Address: 172.67.139.119
Name: us.whitedotsports.com
Address: 104.31.69.41
Name: us.whitedotsports.com
Address: 2606:4700:3032::681f:4529
Name: us.whitedotsports.com
Address: 2606:4700:3030::ac43:8b77
Name: us.whitedotsports.com
Address: 2606:4700:3030::681f:4429

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