We get that error on some accounts when we use the username/password method to connect. Once it happens with an account we have to switch to the session method, the username/password method will never work again (at least it hasn’t for us in the last 6 months or so).
It’s worth noting that this isn’t a problem with SNAP – it happens with other APIs as well. It’s something going on with Facebook. IMHO Facebook is intentionally making it harder to connect via unofficial APIs and developers (like SNAP) are having to rush to catch up with the changes Facebook makes.
