Add support note

Author: rchinn1

src/engage/trait-activation/trait-activation-setup.md

@@ -13,6 +13,8 @@ On this page, you'll learn how to set up the Destination that you'll use to get
 
 You'll first choose a Destinaton to connect to your Audience and use with Trait Activation. Trait Activation supports real-time and batch audiences for the Destinations listed in the table below. Select your Destination, view its Segment documentation, then follow the required setup steps. 
 
+> warning ""
+> Trait Activation only supports [Iterable Classic](/docs/connections/destinations/catalog/iterable/) and [Zendesk Classic](/docs/connections/destinations/catalog/zendesk/) during beta.
 
 |-----------------------|---------------|---------------------------|
 |Destination            |  Type         |  Required Steps           |