I have only tested this with a QNX target but may not be only for QNX targets. I have seen this in Qt Creator versions since the switch was made to only do SSH keys instead of sending the password.
Under devices in preferences, when I press deploy public key, I get a dialog popup for failing to connect. It mentions the Qt platform plugin "cocoa" but the SDP I build against does not have the cocoa plugin since it is built for use on QNX only. I assume deployment of the key should not really have anything to do with the cocoa plugin. Please advise if this is a possible configuration issue or if there is something else going on.
No dialog was shown asking for password.