Fixed Foveated Rendering working on one Quest, but not the other?

I'm using Unity to build games for the Quest. I've been using FFR for the longest time on the single Quest device I was developing for. I've just received and set up a new Quest device, but FFR isn't working on this one. I've already checked, and they have all the same system, software, and versions.

Are there different models of the Quest, based on timing of purchase, that do or don't support FFR?

This is making me crazy.

Thanks, Alex

 

It seems that my old one is 128 GB and new one is 64 GB? Why would that make a difference?

 

I think my biggest issue is, when you call OVRManager.fixedFoveatedRenderingSupported
it says 'True' on both devices. So, although it's supported, it doesn't actually render it?
I'm very confused