Error when passing agent to nmp

[u9g]

When passing a valid (and working) socks5 proxy using the code in this example: https://github.com/PrismarineJS/node-minecraft-protocol/blob/master/examples/client_socks_proxy/client_socks_proxy.js , I get

(node:30580) [DEP0123] DeprecationWarning: Setting the TLS ServerName to an IP address is not permitted by RFC 6066. This will be ignored in a future version.
(Use `node --trace-deprecation ...` to show where the warning was created)
[undefined] error FetchError: request to https://authserver.mojang.com/authenticate failed, reason: Hostname/IP does not match certificate's altnames: IP: 123.456.789.000 is not 
in the cert's list:
    at ClientRequest.<anonymous> (C:\Users\---\Documents\js-projects\xxx-project\node_modules\node-fetch\lib\index.js:1461:11)
    at ClientRequest.emit (events.js:315:20)
    at TLSSocket.socketErrorListener (_http_client.js:469:9)
    at TLSSocket.emit (events.js:315:20)
    at emitErrorNT (internal/streams/destroy.js:106:8)
    at emitErrorCloseNT (internal/streams/destroy.js:74:3)
    at processTicksAndRejections (internal/process/task_queues.js:80:21) {
  type: 'system',
  errno: 'ERR_TLS_CERT_ALTNAME_INVALID',
  code: 'ERR_TLS_CERT_ALTNAME_INVALID'
}