They put stupid restrictions in the software that prevent you from 'casting' or 'airplaying' the content for the purpose of copyright infringement prevention.
To get it on the TV you will need a physical connection - so either iPad to tv with lightning to HDMI (i haven't tested this method personally but should work) or laptop to tv with HDMI cable (this is how i watch it)
We are thinking an MHL2 Cable should work (phone/i-pad)? Which we haven't got. No where on the ipad to put an hdmi cable in, but it is a basic one (lads christmas present last year when he was 9!)
We've got two times ASUS laptops, decent spec, but just 'would't have it' when the subscription bit kicked in.
This Saturday, mates hosting it...he's a bit more techy than me. We will get there!