Roku Mobile App

Help with the Roku Mobile app on Android and iOS, adding channels, using remote control functionality, playing content from The Roku Channel, using Play on Roku, mobile private listening, and more.
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Level 7

Restrict special characters from iOS / Android roku remote app for DynamicCustomKeyboard

I would like to restrict users from being able to type any special characters (i.e. $%^&) in my DynamicCustomKeyboard from the iOS / Android roku remote keyboard. My DynamicCustomKeyboard only allows for alphanumeric values, but when used on the roku mobile app keyboard, users can type any character possible. How can I allow only alphanumeric values? 

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