cmd + opt + esc is not able on macOS Sierra, client version 2.9.0
In version 2.7.1 i could lock mi windows sesion with Cmd + Opt + Esc. Now in version 2.9.0 is gray and can't use it.
we are working on a bugfix. Please check for a new version the next days.
Tanner Ornelas commented
Thank you, it was solved on 2.9.1 and now it says Ctrl + Alt + Supr.