Today’s story is a little note to self, something to remind me when I next hit the same issue.
At $DAYJOB I was just working on some Google Sheets-backed dashboards using Tableau, when the team hit the following error message:

It says:
Unable to complete action
Bad Connection: Tableau could not connect to the data source.
Error Code: 3834D197
Errors occurred while loading the data source.
While debugging this, there were actually two aspects to take into account, that complicated things: one is the source of the error, and the other is Tableau’s behaviour when encountering the error. Both are good to keep in mind for future development.