I just had a look and I can buy a match pass right now for 6 Euros.
However, "
Please note that the iFollow service is only available to clubs playing in the EFL during the 2018/19 season who have opted in to utilise the iFollow platform. Those clubs who have not will have access to the same live streaming opportunity and will be able to provide their fans with access through their own club digital services.
We are therefore unable to provide subscriptions to fans of Accrington Stanley, Aston Villa, Birmingham City, Bristol City, Charlton Athletic, Derby County, Hull City, Forest Green Rovers, Middlesbrough, QPR, Stoke City, Swansea City and Sunderland."
So I'm not sure whether it will be streamed at all, or if it will be streamed from EFL cameras only available to Oxford and not AS fans.