Proximity sensor issues during playing of WhatsApp Audio on my iPhone

Hi jegan194,

If the issue is only occurs when using WhatsApp, you may need to report it to the app developer. For help with what's expected when listening to a message from that app check out the information below found on their support website here: How to play voice messages - WhatsApp

"Play a voice message

1. Tap Play to listen to voice messages you've sent or received. 
2. Listen to the message.

• Through your phone’s ear speaker: Hold the phone up to your ear to play the message through your phone’s speakers.
• On speakerphone: Hold the phone away from your head to play the message on speakerphone. 
• Through your headphones: Voice messages will play through your headphones when they’re connected.

1. While a message is playing, you can tap the 1x icon to increase the speed to 1.5x or 2x.
2. You can also long press the dot located on the waveform and drag it to the timestamp of the message you want to start playing from.
3. Voice messages will continue to play even if you navigate to another chat or group within WhatsApp.

• When you play a voice message and leave the chat, a mini player will appear at the top of your screen.
• You can pause, play, and close the voice message, or navigate back to the original chat."

You can also find helpful information here: Why can't I hear my Voice Messages or Videos?

Find steps to report or contact the app developer here: How to contact an app developer - Apple Support

Cheers.