I was getting this from inside the US, however setting my VPN to LA worked to get around it. I assume this is because that's where the Meta engineers are ¯\_(ツ)_/¯
EDIT: Once accessed there is this note:
> This research demo is not open to residents of, or those accessing the demo from, the States of Illinois or Texas.
EDIT: Once accessed there is this note:
> This research demo is not open to residents of, or those accessing the demo from, the States of Illinois or Texas.
and I'm in TX