Why custom resource records in Google DNS panel is not working?

I bought a domain from domains.google.

Then I went into my panel, connected it to Google Sites, and then I went on to create custom DNS resource records for my subdomains.

Google Sites works perfectly. But my subdomains are not resolving.


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For example, I have added these records. But when I use nslookup to query them, or when I enter them in browser, I get non-existent error. I have waited for more than 72 hours now.

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What should I do?