Airplane Mode / Offline Usage Glitch
Detection
Device kept in Airplane Mode / Offline state continuously during downtime; Family Link reports device offline.
Fix (technical)
Local app timers and scheduled Downtime are enforced offline on device by OS kernel1. Remote instant lock commands queue and execute immediately once network connection resumes. On Google Family Link, offline parent access code can unlock device if needed7.
Fix (relational)
Set house rules requiring devices to remain connected to home Wi-Fi during designated hours.
Residual risk
Real-time remote lock signals do not reach device until Wi-Fi/cellular connection is re-established.
Sources
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apple-support-101619
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google-family-screentime-en