Hi @scon , welcome to Microsoft Q&A forum.
Can you please check below GitHub solution that talks about the same issue:
Redis Cluster + SSL = certificate match error
It is overriding the host parameter:
if ($this->defaults) {
$parameters += $this->defaults;
if (isset($this->defaults['host'])) {
$parameters['host'] = $this->defaults['host'];
}
}
Please let us know if this helps or we can discuss further.