You can force Intune Device check-in from the Company Portal App installed on your Android phone. Afterward, review the logs on your Android device to check if the policy is successfully applied. For more detailed information, refer to: https://learn.microsoft.com/en-us/mem/intune/apps/app-protection-policy-settings-log".
To know about the Intune Default Sync Interval, Please refer to: https://cloudinfra.net/how-to-force-intune-sync-manually-from-a-windows-device/#intune-default-policy-sync-interval link.
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