Google Sheet Columns not reading in Reader

If the Reader was added and new columns were added after the Reader was added you might want to try ReAdding the reader.

What might be happening (and is a fairly common problem) is that when you first add a Reader FME will scan the data and create a schema based on that data/those columns. If you then add new columns but don't Re-add the reader (or update the feature type) then FME doesn't know about the new columns.

Another possible issue is that you have defined the Reader based on a 'Named Range' where the Named Range contains some, but not all, of the columns. Check that if reading a Named Range that the columns which are missing are contained in that range.