Global Monitoring Override Of Managed Availability Messages Failing

Hello,

I have a client that would like the managed availability probes disabled.  I followedthis KB to do this, but the probe emails persist.  My global monitoring overrides are shown below.  The client has two CAS servers, one MBX server, and one Exchange 2010 server as of now.  All three show version 15 build 913.22, also shown below.  This is the version I used with the -ApplyVersion parameter in the Add-GlobalMonitoringOverride command.  

What can I try to resolve this?

Thank you!
Toni