We installed the newest TFS Server (TFS 2018 Update 2) which should run xaml builds. After the update, we started our agent, but our xaml-controller is still offline and I don't know how I start this again..
Any ideas what we can do?
Thanks @PatrickLu-MSFT!! through your help, we found a workaround. Now we use one server for the Source Control etc. (TFS 2018) and another server only for the xaml-app-controller with TFS 2015. So we can build our projects, and have time to create new build definitions.