Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve content/341/bmj.c6273/submit-a-rapid-response, which is not a DOI.
content/341/bmj.c6273/submit-a-rapid-response may be a Handle (DOIs are a special sort of Handle). If content/341/bmj.c6273/submit-a-rapid-response is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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