Teams Settings > General
Tick Open application in background.
Make sure Enable spell check is ticked.
Change App language to English (Australia).
Scroll down and click Save and Restart.
While plugged in to a dock, with headphones connected to the dock:
Settings > Devices
Audio devices – change to Customised Setup.
Speaker – Headphones (Realtek USB Audio).
Microphone – Microphone (Realtek USB Audio).
Secondary Ringer – Speakers (Realtek(R) Audio).