Echo while talking on FaceTime

Hey!

since I bought new iPhone 16 Pro, I’ve got an issue with echos of people hearing themselves

Every time I talk to people on FaceTime or WhatsApp, they complain about hearing themselves. I already clicked a voice isolation in the settings of the FaceTime and WhatsApp conversation and I’ve told them to do the same however it did not solve the problem tho.

I also turned down the volume and so did they but again same echoing problem.

Does anyone have this problem and know how to solve it ?