Some children are left in "harmful situations, or at risk of harm, for too long", according to the report, while "too many children do not get the help they need at the right time", it adds.
The "widespread and serious failures in the recognition of risk" were flagged following the inspection in January.
The problems are not new however; an Ofsted inspection in February 2015 identified concerns in delays to children's cases and mabagement oversight.
The criticism comes two years after the appointment of new director of children's services Alison Murphy in May 2017.
While the latest report acknowledges that leadership has been strengthened in some important areas, these have "not sufficiently addressed the weaknesses in frontline practice and management oversight, in particular for children in need of help and protection".
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