Policy
Allow Microsoft accounts to be optional
This policy setting lets you control whether Microsoft accounts are optional for packaged Microsoft Store apps that require an account to sign in. This policy only affects packaged Microsoft Store apps that support it. If you enable this policy setting, packaged Microsoft Store apps that typically require a Microsoft account to sign in will allow users to sign in with an enterprise account instead. If you disable or do not configure this policy setting, users will need to sign in with a Microsoft account.
8f1d640de2cb AppxRuntimeMicrosoftAccountsOptional Registry
Copy registry mappings
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\MSAOptional (enabled) = 1
HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\MSAOptional (disabled) = 0 Policy notes
This policy setting lets you control whether Microsoft accounts are optional for packaged Microsoft Store apps that require an account to sign in. This policy only affects packaged Microsoft Store apps that support it. If you enable this policy setting, packaged Microsoft Store apps that typically require a Microsoft account to sign in will allow users to sign in with an enterprise account instead. If you disable or do not configure this policy setting, users will need to sign in with a Microsoft account.