Modify Mobile App with custom dict/plist after it's been deployed?

[Tguil15]

I'm trying to make an adjustment to the Outlook app for iOS and enforce Biometrics for the app. I have tested the following settings and know they work on a net new app deployment:

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<dict>
<key>com.microsoft.outlook.Auth.Biometric</key>
<string>true</string>
<key>com.microsoft.outlook.Auth.Biometric.UserChangeAllowed</key>
<string>false</string>
</dict>

I'm trying to understand if I add this to my existing App that's deployed across all my iPhones currently if they will just update and enforce biometrics, or will I have to uninstall and then deploy the new app with the settings added?