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Why does my DUO page show up blank on my iOS device?

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Created by Josh Willis, last modified on Aug 17, 2022

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While attempting to log in to a Duo-protected application on iOS or macOS, the Duo Prompt does not display as expected:

To fix this issue:

iOS 12 or newer:

Navigate to Settings > Screen Time > Content & Privacy Restrictions > Content Restrictions > Web Content.
Uncheck Limit Adult Websites to completely disable content restrictions.

iOS 11 or older:

Go to Settings > General > Restrictions > Websites.
Uncheck Limit Adult Content to completely disable content restrictions.

macOS 10.15 (Catalina) or higher:

Open System Preferences.
Navigate to Screen Time > Preferences > Content & Privacy.
Set any Web Content restrictions to Unrestricted access.