Policy
Configure minimum PIN length for startup
This policy setting allows you to configure a minimum length for a Trusted Platform Module (TPM) startup PIN. This policy setting is applied when you turn on BitLocker. The startup PIN must have a minimum length of 4 digits and can have a maximum length of 20 digits. If you enable this policy setting, you can require a minimum number of digits to be used when setting the startup PIN. If you disable or do not configure this policy setting, users can configure a startup PIN of any length between 6 and 20 digits. NOTE: If minimum PIN length is set below 6 digits, Windows will attempt to update the TPM 2.0 lockout period to be greater than the default when a PIN is changed. If successful, Windows will only reset the TPM lockout period back to default if the TPM is reset.
ebc79e662ece MinimumPINLength_Name Registry
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HKLM\Software\Policies\Microsoft\FVE\MinimumPINPolicy notes
This policy setting allows you to configure a minimum length for a Trusted Platform Module (TPM) startup PIN. This policy setting is applied when you turn on BitLocker. The startup PIN must have a minimum length of 4 digits and can have a maximum length of 20 digits. If you enable this policy setting, you can require a minimum number of digits to be used when setting the startup PIN. If you disable or do not configure this policy setting, users can configure a startup PIN of any length between 6 and 20 digits. NOTE: If minimum PIN length is set below 6 digits, Windows will attempt to update the TPM 2.0 lockout period to be greater than the default when a PIN is changed. If successful, Windows will only reset the TPM lockout period back to default if the TPM is reset.