Couple of quick questions:
1. What web browser are you using? Can you try the same Share link in a different browser/
2. What version of Tableau Server are you using?
Thanks very much for responding!
The problem seems to have resolved itself this morning when I tried again, regardless of browsers (I was using IE previously, but now tried on both IE and Chrome).
That said though, we've been having a lot of stability issues with our server (workbooks that used to work not loading anymore, server getting disconnected, slowness). We're using Tableau Server v9.2.0 btw, and due for an upgrade soon (to v9.2.13). Not sure if the server was the cause though the error only happened to a few workbooks so didn't seem systemic...
I have been getting the same error when trying to embed share code into a share point web part.
I also get a message saying that the code may have been changed when I attempt to preview the page.