Teams in general is garbage.
It's a memory hog. If I have too many programs open and then have a video call, it just drags my computer down and sometimes gives me memory warnings.
I don't know if it's my phone, headset, or the Teams app, but the Teams app doesn't seem to like my Plantronics Bluetooth headset. My Bluetooth headset shows as connected to my phone. I'll select the Bluetooth sound option in the Teams call, but it automatically switches back to speaker. Sometimes if I keep changing it back, it eventually stays on Bluetooth. It makes me rage.