Microphone does not work when speaker is on

So, for a few days I have been having problems with my microphone on video call or call with loudspeakers. I tried Whatsapp video call, Whatsapp voice call with loudspeaker, Zoom, and Google Meet and the problems are same: my voice cannot go through, while I can hear other people's voice. I tried using mic checker app and both my microphones are fine. I also have tried recording video and audio and they both work just fine. I also have checked the applications' permission and they do have permission to use my microphone. Last time, I tried zoom meeting, and muted my **speaker**, and my voice went through. However, when I turn on my speaker again, my mic cannot pick up any sound. Is there a way I can fix this so that my speaker and my mic can be on at the same time?