Does this help?
2021/08/11 23:50:16.974 INFO tls.issuance.acme done waiting on internal rate limiter {“identifiers”: [“www.domain.net,www.domain.tk,www.domain.ml”], “ca”: “https://acme.zerossl.com/v2/DV90”, “account”: “”}
2021/08/11 23:50:17.243 ERROR tls.obtain could not get certificate from issuer {“identifier”: “domain.net,domain.tk,domain.ml”, “issuer”: “acme.zerossl.com-v2-DV90”, “error”: “HTTP 400 urn:ietf:params:acme:error:rejectedIdentifier - Invalid DNS identifier [domain.net,domain.tk,domain.ml]”}
2021/08/11 23:50:17.244 ERROR tls.obtain will retry {“error”: “[domain.net,domain.tk,domain.ml] Obtain: [domain.net,domain.tk,domain.ml] creating new order: request to https://acme.zerossl.com/v2/DV90/newOrder failed after 1 attempts: HTTP 400 urn:ietf:params:acme:error:rejectedIdentifier - Invalid DNS identifier [domain.net,domain.tk,domain.ml] (ca=https://acme.zerossl.com/v2/DV90)”, “attempt”: 1, “retrying_in”: 60, “elapsed”: 4.2334171, “max_duration”: 2592000}
2021/08/11 23:50:17.431 ERROR tls.obtain could not get certificate from issuer {“identifier”: