All the best today! Call the meeting first thing.
To feel more confident, whether it's in person or online Teams/Zoom:
Have breakfast.
Stay off the caffeine and sugar and drink plenty of water.
Control your breathing from your diaphragm (belt area) not your chest - slower deeper breaths will slow your heart rate, giving your brain oxygen for thinking and your voice power for speaking.
Try the Power Pose before the meeting - lock yourself in the loo, stand feet apart, hands on hips, head up, look up, smile, while doing the slow deep breathing.
In the meeting, sit up straight and poised, making eye contact, thinking before you speak, controlling your pace (again the breathing will help.)
Explain what happened, apologise if you made a mistake, ask what needs to be done going forwards.
Make notes and ensure you do what's necessary.
You’ll feel so much better after it's done, even if the outcome is not what you hoped. You won't have uncertainty hanging over you.
You can do this. Please check in afterwards. XX