after the latest update when i connect my Bluetooth device to my phone, i don't get option of switching to Bluetooth calling on WhatsApp, teams, duo or any other app . But it's working on vlc, mx player, YouTube while media consumption. I have done setting reset. No luck.
I'm facing this issue after the latest security update. I don't see Bluetooth icon which is beside speaker icon in WhatsApp. The same issue with MS teams which i click on options to select i don't see Bluetooth icon. It usually issue in third party apps. While I'm doing regular call I'm able to connect through headset.
you might need to clear cache if that don't work, you can try update whatapp, if no update show then uninstall and reinstall the apps again , hope that work.