Cant find the external link in excel file

Hi, our consultant gave us a file. When opening it is wants to update a link. To update we have to login to the SharePoint of our consultant. I don't have access to their SharePoint. I also cant find the link in the file to their SharePoint. i only see my onw link. 

Does anyone knows how to delete the message? See screenshots.

(ps the consultant doesn't know how to delete it and sent me an even more broken version of the file.)