MAC-randomisation or router identifier mismatch
Detection
A router rule refers to an identifier but the vendor does not show a stable, documented device association.
Fix (technical)
Do not provide change instructions. Ask the router vendor how its parental-control association works and validate that the named child device is covered. Add device/account controls instead of relying on a single router identifier. [esafety-parental-controls; saferinternet-at-technical-controls]
Fix (relational)
Avoid turning routine troubleshooting into an accusation; ask jointly which devices are used and why.
Residual risk
No inspected source evaluated this claim for a current consumer router.
Sources
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esafety-parental-controls
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saferinternet-at-technical-controls