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APPLIES TO: 
2015 
2019
Subscription Edition
In a mixed environment, if you create a new trusted application server, you must set the next hop pool to be a Skype for Business Server 2019 pool. In a mixed environment, both the legacy pool and the Skype for Business Server 2019 pool appear in the drop-down list. Selecting the legacy pool isn't supported.
Important
If you're migrating a trusted application server, you should also update the version of UCMA you're using. If you create a new Trusted Application Pool for Skype for Business Server 2019, you should update UCMA to the version that is included with Skype for Business Server 2019 or the latest version available.
Select Skype for Business Server 2019 as next hop when creating a Trusted application server
Open Topology Builder.
In the left pane, right-click Trusted application servers and select New Trusted Application Pool.
Enter the Pool FQDN of the trusted application pool and select whether it is single-server or multiple-server.
Select Next.
On the Select the next hop page, from the list, select the Skype for Business Server 2019 Front End pool.
Select Finish.
Select the top node Skype for Business Server, and from the Action menu select Publish.
Verify that the Trusted Application Pool is created successfully and is associated with the correct Front End pool.