CrossDoc: Create a new Coda API token

When setting up a new CrossDoc connection, you may get prompted to ‘+ Set up another account’ to add the permission to read and write to an external table. After clicking ‘set up’ I get a screen that says: “Create a new Coda API token”:

What is the correct value to put in for ‘Doc or table to grant access to’?

I have tried CrossDoc’ing the target table into my doc, and then copy the url from the ‘Last synced X hrs ago from here’ and that was not successful.