Hi there! I hope you are doing well. My name is, Zadee. I'm an Independent Advisor and a Microsoft user like you. Sorry to hear about your experience. I'll try my best to help you today.
Please try turning off attenuation completely in discord under Voice & Video setting. Slide the bar completely to the left until it reaches 0. Also, toggle OFF "When I speak" and "When others speak".
Thank you. Did that help at all?