Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve core/journals/psychological-medicine/volume/65F67AE0A971AFB92D1BD5EBF4DCD4F5, which is not a DOI.
core/journals/psychological-medicine/volume/65F67AE0A971AFB92D1BD5EBF4DCD4F5 may be a Handle (DOIs are a special sort of Handle). If core/journals/psychological-medicine/volume/65F67AE0A971AFB92D1BD5EBF4DCD4F5 is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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