Not a DOI

The resolution service at https://doi.org resolves DOIs. You have attempted to resolve core/journals/infection-control-and-hospital-epidemiology/volume/FAF9C48608D0B2EF642634D96FACFF99, which is not a DOI.

core/journals/infection-control-and-hospital-epidemiology/volume/FAF9C48608D0B2EF642634D96FACFF99 may be a Handle (DOIs are a special sort of Handle). If core/journals/infection-control-and-hospital-epidemiology/volume/FAF9C48608D0B2EF642634D96FACFF99 is a valid Handle you should be able to resolve it at https://hdl.handle.net.