iPhone 4 - Unable to log-in using Facebook. It logs into Facebook instead...

[MexiKiwiMike]

iPhone 4, latest versions of FB, Spotify and iOS.

Not a credentials issue. Currently listening to Spotify on Web App on PC.

Action: Launch Spotify app, click Log In Using Facebook

Results:

- Either, already authorised, then shows my news feed. Clicking 'Done' returns to Spotify Log In screen; or

- Straight to showing my Facebook news feed within the Spotify app.Clicking 'Done' returns to Spotify Log In screen

[MexiKiwiMike]

Am able to login to Spotify app using FB on my iPad (via Spotify in-app browser -> FB app -> Spotify app).

Seems to be an issue specific to the old iPhone not hand-shaking with FB properly...