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Domain registrar doesn't accept the CNAME target
Some domain registrars reject yourworkspace.plutio.com as a CNAME target value.
Solution
Try adding a trailing dot after the domain. Enter it as:
yourworkspace.plutio.com.
The trailing dot is technically correct DNS syntax and most registrars that reject the value without it will accept it with the dot.
If it still doesn't work, check that you're entering the value in the CNAME record's target/value field, not the hostname field.
See also: Custom domain setup