Hi
@Members_zwomwAy and warm welcome
👋Few thing you can try
Restart your phone
Clear phone apps cache in settings > apps > phone > storage > clear cache
Go to settings > sounds and vibration > system vibration > toggle on "touch interactions" and "dialing keypad" do same but go to system sound and toggle both options if they are both on try turn it off and see if that works
When in the call swipe down to access quick settings panel then come back to call and see if works that way
When in the call before entering any number press * and then enter number
See if any of these options help.
