FF Chat Flow Permissions Problem

I've used the Chat flow available off the shelf in FF but seem to be having issues with it; Run mode-only notification: Firestore Security Rules Error on ListView: Missing or insufficient permissions.

This happens when I try to add a conversation. I've changed the Firebase security rules and enabled Everyone for now. Deployed them. Still get the error above.

I'm using Run to test, which I think supports the Chat flow?

Any ideas would be appreciated!