I use Toddle with Xano and I have the same problem with an error reported on setting the session cookie on sign-in. I can't remember if I've reported it to the Toddle fellaz before. It does save the auth token for use in the rest of the app but it does report an error in the browser console & it triggers the On Error workflow for the Set Session Cookie action rather than the On Success. If you handle it through the On Error then it will handle the auth token for you and work OK, although it seems to only authenticate for an hour, possibly 2. To be honest, I just wanted to make progress and I'd got it to work so I didn't make too big a deal of it but certainly before the app goes live I'll need it dealt with. I record it in the Feedback section. As I say, if you just wanna make progress for now, just handle it on the On Error event & hopefully the Toddle fellaz will resolve it.