Voice messages can not be heard on ear, but only on speakers in Whatsapp/Telegram/Signal
When I hear audio messages in whatsapp it shows that the audio is silenced, no audio, in resume, i cant hear a thing if not in speaker mode.
iPhone 15
I remade this topic so i could answer the question not responded in this forum, in resume, try putting your phone in the ear while trying to hear the whatsapp audio, and then press the volume up button, there, problem solved.