I came up with a solution that appears to be working. 1. Disabled provisioning at the vcenter level. 2. Backed up my ADAM database 3. Connected to the ADAM database with ADSI Edit, found the pool ...
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I came up with a solution that appears to be working. 1. Disabled provisioning at the vcenter level. 2. Backed up my ADAM database 3. Connected to the ADAM database with ADSI Edit, found the pool in question and modified the Attribute: pae-ServerProtocolAllowOverride from 0 to 1. 4. Closed ADSI edit. Went back to Horizon admin, re-enabled provisioning. In the pool settings the option was still grayed out but it was set to allow the user to change, however still didn't get the option to change the protocol in the client until I changed the default for the pool from PCoIP to Blast, and then changed it back. Now the end user can choose which protocol they want to use in the Horizon client.