ssh servername /Users/steven/.ssh/config: line 7: Bad configuration option: useroaming /Users/steven/.ssh/config: terminating, 1 bad configuration options
Line 7 is
UseRoaming no which I because of CVE-2016-0777
$ ssh -V OpenSSH_7.2p2, LibreSSL 2.4.1
Solution: Comment out that line as the version of OpenSSH that ships with macOS 10.12 no longer had that insecure feature.