Cannot issuing ssl for Child Domain

When i try to issue a ssl certificate for my Child Domain i get this error message in log:
test.qalab.dev:Verify error:Invalid response from http://test.example.com/.well-known/acme-challenge/xKtgbtm0cJ5SCXabTjnk_ZciTugR1WHsiEVy7zsuLwc
And the code response is 404:

404 Not Found

404

Not Found

The resource requested could not be found on this server!


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