Last part of error informing me that i didn't create listener, but in
HA creation wizard, on Specify Replicas - Listener tab, when a click
Create an availability group listener option and Static IP mode, an
Add..button greyed out and no subnets available!
Can you try creating a Client Access Point in your Failover Cluster Resource Group inside Failover Cluster Manager? This is not the right way to create the listener name but it will give you some ideas as to why this step is failing. Keep in mind that
the creation of the Availability Group listener name is being passed to the WSFC to create the Client Access Point.
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