The “Add Services” link in the Actions menu is also disabled in 1.7 on HDP 2.2. I went through the steps at https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=38571133, but there was no change. I also looked at the ambari-server jar. Since this is a test environment, I unzipped it and added the SAMPLESERV directory from the link above to it, rezipped everything, and put it in place of the original jar. After restarting the server, there was no change in behavior.