I think we'd need to see the FeatureMerger parameters and which of the outputs is the Requestor and the Supplier. Without that, it's hard to diagnose a problem. Also, where does the 16441 come from (it's not in your "outputs" so it's hard to know if it's from output 1 or 2)?
But it looks like you need to have Output2 as the Requestor and Output1 as the Supplier. The Requestor/Supplier join attributes would both be outline_id. The Expected Output would come from the Merged port.
Don't check "Process Duplicate Suppliers" because I don't think there should be any. Accumulation Mode should be Merge Supplier and Conflict Resolution would be Use Requestor.
That way you should just get the Name column copied over.
If it's still going wrong, check for leading or trailing spaces causing join issues. An AttributeTrimmer is your friend there. Change the Comparison Mode from Automatic to Numeric as that might help. If it's coming from CSV then the default might be to treat it as a string.