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•What is the primary question addressed by this study•Can we decrease the proportion of older adults living with depression in residential aged care facilities by training staff on how to use behavioural activation?•What is the main finding of the study•Training residential aged care staff on how to use behavioural activation has fleeting and non-sustainable effects on symptoms of depression and anxiety.•What is the meaning of the finding•Interventions that require activities to be added to usual routine practices of staff working in residential aged care facilities produce non-sustainable results, particularly in the context of competing demands such as the COVID-19 pandemic.