The path /.well-known/pki-validation has been used by Sectigo for DV, so maybe this means that ZeroSSL is now trying to issue you a Sectigo certificate instead of a Let's Encrypt certificate?
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The path /.well-known/pki-validation has been used by Sectigo for DV, so maybe this means that ZeroSSL is now trying to issue you a Sectigo certificate instead of a Let's Encrypt certificate?