Why does the CNAME record continue to fail?

CNAME Flattening
Some DNS providers have a limitation in that they cannot handle multiple CNAME records for the same domain. This can cause issues when trying to map a domain to another domain that already has a CNAME record set up.
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CNAME Loop
A CNAME loop occurs when a CNAME record points to another CNAME record in a continuous chain. This will result in an error as the system is unable to resolve the final destination.
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Time-to-Live (TTL) Conflicts

CNAME records have their own TTL values, and these values can conflict with the TTL values of other records in the domain, causing issues with caching and resolution.
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Misconfigured CNAME

If a CNAME is set up incorrectly, it can lead to resolution errors or incorrect mapping to the intended target.
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SSL/TLS Certificate Issues

Using a CNAME record for a secure website can cause issues with SSL/TLS certificates, as the certificate is issued for a specific domain name, not an alias.