2FA, Duo Prompt display issues related to iOS or macOS

How do I resolve Duo Prompt display issues related to iOS or macOS content restrictions? Once I enter my net ID and password, I see only a blank screen.

For help in solving this error, please visit DUO's article here.

Please note, in the step for macOS 10.15 (Catalina) or higher where you allow Content Restrictions, you must allow verify.uillinois.edu in addition to duosecurity.com.

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