MFA & Verification Issues

Fix Microsoft Phone Verification Not Detecting Pound Key (#)

Khadija Khan Oct 1, 2026 868 views

Question details

Users are unable to complete Microsoft account sign-in because the automated phone verification system does not recognize when the pound key (#) is pressed.

How to Fix Microsoft Phone Verification Not Detecting the Pound Key (#)

Product: Microsoft Account / Authenticator
Device & OS: not provided
Scenario: Signing into a Microsoft account using phone call verification, often after changing devices or losing access to the Microsoft Authenticator app.
Observed behavior: The automated voice system fails to register the pound key (#) input, leading to repeated failed sign-in attempts and a potential 24-hour account lockout.

Before you start

Ensure you have a stable cellular connection and that your phone's keypad tones (DTMF) are enabled in your device's dialer settings so the automated system can hear your inputs.

Solution 1Recommended

Wait for Instructions and Try Alternative Keys

The automated system may ignore inputs if pressed too early, or it might accept an alternative key like the star (*) key to bypass the pound key glitch.

Automated phone verification systems often block inputs until the voice prompt has completely finished playing. Pressing keys prematurely can cause the tone to be ignored.

Wait for the voice prompt to finish

Listen carefully to the entire automated phone message. Do not press any keys on your dial pad until the voice instruction has completely concluded.

Press the pound key once

Firmly press the pound key (#) a single time. Wait a few seconds for the verification system to process the tone instead of pressing it multiple times.

Try the star key as an alternative

If the pound key is still not recognized by the automated call, try pressing the star key (*) instead, as the verification service sometimes accepts this as a fallback alternative.

Avoid 24-Hour Lockouts: Do not make repeated rapid attempts if the keys are not working. Multiple failed verification calls will trigger a temporary 24-hour security lockout on your Microsoft account.

Solution 2

Contact Microsoft Support for Account Recovery

If you are currently locked out or the phone verification continues to fail, you will need to engage Microsoft Support to verify your identity.

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Frequently Asked Questions

Why does my smartphone not register the pound key during Microsoft automated calls?

Smartphones sometimes fail to send DTMF (Dual-Tone Multi-Frequency) tones properly over Wi-Fi calling or VoLTE connections. Disabling Wi-Fi calling or temporarily switching your cellular network mode to 3G/4G can help the system recognize your key presses.

What happens if I fail phone verification multiple times?

Microsoft's security system will temporarily lock your account, typically for 24 hours, to prevent unauthorized access. You must wait for this period to fully expire before trying to sign in again.

Can I use an email address instead of phone verification?

Yes, if you previously set up an alternative recovery email address on your Microsoft account, you can select 'Sign in another way' or 'I don't have these any more' on the login screen to receive the verification code via email instead.

How do I turn on keypad tones for verification calls on my phone?

On most devices, you can enable keypad tones by going to your phone's dialer settings, selecting 'Sounds and vibration', and ensuring that 'Dial pad tones' or 'DTMF tones' is turned on.

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