Unprocessable content. You reached a CA set count limit in the account or there exists another version with the exact same certificates.
This error displays when the count of certificates submitted in the request body exceeds the limit allowed for the version.

Content-Type: application/problem+json;charset=UTF-8
    "detail": "The maximum number of certificates allowed per CA set version is 300. Number of submitted certificates is 302.",
    "instance": "/tcm-api/error-types/certificate-limit-reached?traceId=-6957860028400708642",
    "maxCertificatesPerVersion": 300,
    "status": 422,
    "submittedCertificatesCount": 302,
    "title": "Maximum allowed certificates limit has been reached.",
    "type": "/tcm-api/error-types/certificate-limit-reached"