1) If your headset is turned off already, skip to step 3. If it is turned on, hold the teams button in on the headset til it flashes red.
2) Wait 5 seconds.
3) Put the headset on and hold the teams button once more until you hear a chime - This should be the 3rd message you receive, so... Power on / battery level / the "chime" that signals the headset is in pairing mode.
4) Hold the button in on the dongle for 1s to put that in pairing mode also and the two should pair up after a few seconds.