Couchbase Document Revision Conflict with missing document

Question

I was told by my team that a document that other documents are referencing is missing. I have the document saved in a backup and I'm trying to add it to the database through the Sync Gateway using curl.

curl -vXPUT -H'Content-Type:application/json' -d"@mydocument" "http://128.0.0.1:4985/mydatabase/aa987654-3210-4567-89cc-cba121212121"

I am getting the following response:

{"error":"conflict","reason":"Document revision conflict"}

However, if I try to get the document using that id:

curl -vXGET "http://128.0.0.1:4985/mydatabase/aa987654-3210-4567-89cc-cba121212121"

I get the response:

{"error":"not_found","reason":"missing"}

I've also tried;

curl -vXGET "http://128.0.0.1:4985/mydatabase/aa987654-3210-4567-89cc-cba121212121?revs=true&open_revs=all"

It comes back with the same response.

I also tried logging into the Couchbase server and querying the database directly:

select * from mydatabase use keys "aa987654-3210-4567-89cc-cba121212121"

It came back with a result size of 0.

  "results": [],
  "metrics": {
    "elapsedTime": "1.523366ms",
    "executionTime": "1.442059ms",
    "resultCount": 0,
    "resultSize": 0
  }
}

I'm not sure what to do as it says there is no document by that id, but if I try to add it, it says there's a conflict. What can I do to resolve this?

Thanks