It sounds like your phone's DTMF (Dual-Tone Multi-Frequency) tones—which are used to communicate keypresses during calls—are not properly sending the "1" tone, or the system you're calling is not recognizing it.
Here are some possible reasons and fixes:
- Your Carrier or Network Issue
- Some carriers may have issues with transmitting certain DTMF tones.
- Fix: Try calling from a different phone or switching to a different network (e.g., using Wi-Fi Calling if available).
- iPhone DTMF Tone Settings (if using iPhone)
- Apple doesn't provide an option to change DTMF tone settings, but resetting network settings can help.
- Fix: Go to Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings.
