Root CA

[rac-HH]

I use a software which checks the key against a list of trusted Root CAs. There is a solo CA included:

Certificate:
    Data:
        Version: 1 (0x0)
        Serial Number:
            c4:47:63:92:8f:f4:be:8c
        Signature Algorithm: ecdsa-with-SHA256
        Issuer: C = US, ST = Maryland, O = Solo Keys, OU = Root CA, CN = solokeys.com, emailAddress = [email protected]
        Validity
            Not Before: Nov 11 12:51:42 2018 GMT
            Not After : Oct 29 12:51:42 2068 GMT
        Subject: C = US, ST = Maryland, O = Solo Keys, OU = Root CA, CN = solokeys.com, emailAddress = [email protected]

But the solo v2 key is rejected with "invalid root certificate". So I guess v2 use another CA. If so, where can I find this certificate?