People cannot hear me on video calls

To be more specific, people can hear me on FaceTime but not on messenger or WhatsApp or on the speaker either, while I can hear them. Siri also cannot hear me when I open it from the settings but he can hear me when I open it from the screen. I hope you have a good idea now. Thanks in advance.

I have already checked it and check the other microphones too and all of them are working. But I can add that Siri does not work when I open it from the setting. While it works from the screen.

Video calls are perfect with FaceTime but not with messenger or WhatsApp

I have done all the tests but in vain.

Thanks snyway.