A lot of trouble getting this going.. Still not entirely sure what the problem was. In the end i assumed it had to be the UID i was using so went back to the groups page 'graph' and pulled out every digit string on there (three of them all the same length). And added them all to the sync settings (note adding the page name broke it!).
I also disabled all migration options on the advance settings in the app itself (guidance on another plugin suggested this).