I am using a Sony S7 R2 in the studio setting. I have used this 90 mm macro lens for portraits before with strobes and no problems. Prior to trying today I was using a 24 to 70 G. It fired my strobes every time with no issues. When I attached the 90 mm, the strobes stopped firing when I push the shutter. All strobes fire when hitting the button on the receiver. Am I doing something wrong?

I use this lens for macrophotography, and use both on and off-camera flashes. I don't think the lens has anything to do with the strobe not firing. Or are you using TTL? I use manual settings, and set the off-camera flashes to slave. The camera should set the flash, regardless of what lens you use, and also make sure to use the flash sync speed. Hope you get it figured out.