600EX RT

Hi folks.
Got myself a 600EX RT and a YN-E3-RT which sits on my 7D.
I'm hoping one of you can tell me I’m doing something silly.
When I take a photo using Av at F5.6 (or any other) on ETTL my flash goes off but my camera continues as if there was no flash onboard.
It’s as if the camera doesn’t see the flash.
My flash settings are:
E-TTLl ll
1st curtain
FEB 0
Exp Comp 0
Evaluative
Is there a setting I’m missing?
Got myself a 600EX RT and a YN-E3-RT which sits on my 7D.
I'm hoping one of you can tell me I’m doing something silly.
When I take a photo using Av at F5.6 (or any other) on ETTL my flash goes off but my camera continues as if there was no flash onboard.
It’s as if the camera doesn’t see the flash.
My flash settings are:
E-TTLl ll
1st curtain
FEB 0
Exp Comp 0
Evaluative
Is there a setting I’m missing?