nodeloc免费cdn无法申请https证书

各位大佬大家好，无法使用nlcdnACME申请证书，已确认zerossl账号信息无误，并切换多家证书服务商，请求大佬指导帮助，谢谢。
以下是提示信息
证书生成失败：get directory at ‘https://acme.zerossl.com/v2/DV90’: Get “https://acme.zerossl.com/v2/DV90”: tls: failed to verify certificate: x509: certificate signed by unknown authority