IPhone keypad not registering during IVR calls (e.g banking automation) then unable to be heard on call

I have never had this problem before. Whenever I call a call centre with IVR keystroke requirements (e.g “press 1 for customer service”) the keystroke does not register at all. Then if the IVR puts me through to a caller they cannot hear me.

iPhone 13 max pro

• I have restarted my phone
• I have updated my phone
• I have changed the incoming call banner to full screen as some fixes suggested
• I have pressed mute as some fixes suggested
• I have no carrier service updates
• I have the issue with any call centre that other phones don’t have an issue with.
• I can make normal phone calls with no issue

Please help.