Ctrl + Enter should add a line break to the message just like other messaging programs
Messaging programs I use (including regular Skype) all allow adding line breaks to messages with Ctrl + Enter. In Skype for business Ctrl + Enter initiates a call. It would be more intuitive if Skype for Business worked like other messaging programs with regards to Ctrl + Enter.
Here is a larger thread, vote there and maybe they'll ignore this for only another four years: https://www.skypefeedback.com/forums/299913-generally-available/suggestions/8743789-enter-for-newline-ctrl-enter-to-send-message
Please do this, I am tired of accidentally calling people.
No it has to be a line brake! Stupid thing. Normal Skype also uses ctrl+enter for new line.