In Mac OSX, natively, a user can use Option + Left arrow or Option + Right arrow to move the cursor back one word or forward one word. That's a consistent behavior in every application on the Mac.
RingCentral App introduced additional keyboard shortcuts in 220.127.116.111 Web, 18.104.22.16882 Mac (Intel) release that changes the native behavior. In RingCentral App, using Option + Left arrow takes a user back in history. If a user is typing a message and wants to go back a word, they'd use Option + Left arrow, but RingCentral App will take them to the previous history. That means, the user can't use native OSX shortcut and their attention is diverted away from typing the message on to the previous history. What a terrible behavior and choice of keyboard shortcuts!
Can you revert the keyboard shortcut for Option + Left arrow/Right arrow OR give users the ability to choose their shortcut for actions OR remove shortcuts a user feels unnecessary? Your developers must be familiar with Visual Studio Code's flexibility of keyboard shortcuts. Visual Studio Code has really sane and flexible keyboard shortcut options. Perhaps you can provide similar functionalities.
I can see that Ring Central does a consistently poor job of QA'ing their application. Hopefully your management can invest in more and better QA. Hopefully, your product managers and developers can work closely on user experience in case you don't have a dedicated user experience team.