I am new to Android but have got a new phone running 5.0.1 using my Gmail account administered by my university in New Zealand. However I am unable to purchase apps in the Google Play store. I am able to download free ones but no any for which I have to pay money. Instead I get an error which says
Error while retrieving information from server[RPC:S-7:AEC-0 ...] The ... is a 13 letter code in the format XXXX-XXXX-XXXXX which seems to change everytime I try.
I have tried restarting, updateing, clearing the cache of the play store, Download Manager, Google play services and have added and removed my primary gmail account and done the same. I have done everything suggested here: https://support.google.com/googleplay/troubleshooter/4592924
How can I fix this?