Arc patch fails: EXCEPTION: (ConduitClientException) ERR-INVALID-AUTH: Unknown Error

class ConduitFuture#91 (6) {
  protected $client =>
  class ConduitClient#46 (11) {
    private $uri =>
    class PhutilURI#47 (9) {
      private $protocol =>
      string(5) "https"
      private $user =>
      string(0) ""
      private $pass =>
      string(0) ""
      private $domain =>
      string(26) "ourdomain.phabricator"
      private $port =>
      string(0) ""
      private $path =>
      string(5) "/api/"
      private $query =>
      array(0) {
        ...
      }
      private $fragment =>
      string(0) ""
      private $type =>
      string(3) "uri"
    }
    private $host =>
    string(26) "ourdomain.phabricator"
    private $connectionID =>
    NULL
    private $sessionKey =>
    NULL
    private $timeout =>
    double(300)
    private $username =>
    NULL
    private $password =>
    NULL
    private $publicKey =>
    NULL
    private $privateKey =>
    NULL
    private $conduitToken =>
    NULL
    private $oauthToken =>
    NULL
  }
  protected $conduitMethod =>
  string(23) "differential.querydiffs"
  private $profilerCallID =>
  int(0)
  private $proxied =>
  class HTTPSFuture#90 (19) {
    private $handle =>
    resource(139) of type (curl)
    private $profilerCallID =>
    int(1)
    private $cabundle =>
    string(50) "/opt/phacility/libphutil/resources/ssl/default.pem"
    private $followLocation =>
    bool(true)
    private $responseBuffer =>
    string(0) ""
    private $responseBufferPos =>
    NULL
    private $files =>
    array(0) {
    }
    private $temporaryFiles =>
    array(0) {
    }
    private $rawBody =>
    NULL
    private $rawBodyPos =>
    int(0)
    private $fileHandle =>
    NULL
    private $method =>
    string(4) "POST"
    private $timeout =>
    double(300)
    private $headers =>
    array(1) {
      [0] =>
      array(2) {
        ...
      }
    }
    private $uri =>
    string(62) "https://ourdomain.phabricator/api/differential.querydiffs"
    private $data =>
    array(3) {
      'params' =>
      string(23) "{"revisionIDs":["255"]}"
      'output' =>
      string(4) "json"
      '__conduit__' =>
      bool(true)
    }
    private $expect =>
    NULL
    protected $result =>
    NULL
    protected $exception =>
    NULL
  }
  protected $result =>
  NULL
  protected $exception =>
  NULL
}