I'm having the same problem as was posted here but unfortunately the person posting said they solved the "formatting problem" but never explained further: https://lucidchart.zendesk.com/hc/en-us/community/posts/360018251586-Excel-data-imported
For some reason when I tested the link excel data feature it worked perfectly. Then when I went back to use it with my full dataset everytime I try to link it to a shape rather than the data I get the following message in the shape "{{=referencekey(1).' Contact Name '}}" where Contact Name is the header of the column I'm trying to display.
Any help would be much appreciated!