Rekonn - Friday, January 19, 2018 9:50 PM

Think I found the answer, found the links below that describe the need to increase the ms-DS-MachineAccountQuota attribute from its default of 10. I think the original error message from the AG Wizard is a red herring.

Creating listeners with SQL Server AlwaysOn suddenly stopped working! - SOLVED
https://stackoverflow.com/questions/33717629/creating-listeners-with-sql-server-alwayson-suddenly-stopped-working-solved

Resolving an Error When Creating an Availability Group Listener
http://www.sqlservercentral.com/articles/always+on/145147/

Looking at Failover Cluster Manager on wal1qa-dw1a supports the scenario described on those links too: "The text for the associated error code is: Your computer could not be joined to the domain. You have exceeded the maximum number of computer accounts you are allowed to create in this domain. Contact your system administrator to have this limit reset or increased."