You’re incorporating subdomains into your IP address which is not a valid/supported FQDN.
You’ll need to login to your registrar/DNS portal and:
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add an A record for your server which links to your IP address, and
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CNAME records for all the other subdomains which link back to your A record.
I see you mentioned on another post that you have samuel.com which is currently using the following nameservers:
NS39.WORLDNIC.COM 162.159.26.212
NS40.WORLDNIC.COM 162.159.27.146
According to the whois lookup your domain is on Network Solutions, LLC, so you may need to login there to do this, unless you’re using another DNS provider, in which case login there to update it.
You’ll create the following records:
A: learn.samuel.com → 143.198.230.112
CNAME: create.samuel.com → learn.samuel.com
CNAME: apps.samuel.com → learn.samuel.com
CNAME: preview.samuel.com → learn.samuel.com
etc etc etc for any additional domains you need