Select the 'Require lowercase letters' for LowercaseLetters to allow Use this policy setting to configure the use of lowercase letters in the Microsoft Passport for PIN. If you enable this policy setting, Microsoft Passport for Work requires users to include at least one lowercase letter in their PIN. If you disable or do not configure this policy setting, Microsoft Passport for Work does not allow users to use lowercase letters in their PIN. Counter Measure: Configure this setting depending on your organization's requirements. Potential Impact: Depending on configuration, the work PIN will either allow or prevent the use of lowercase letters.

(1) GPO: Computer Configuration\Administrative Templates\Windows Components\Microsoft Passport for Work\PIN Complexity\Require lowercase letters (2) REG: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\PassportForWork\PINComplexity\LowercaseLetters