Help with Eyefinity and monitors

Basics:
Windows 10
2x ASUS VN248H-P monitors (both HDMI)
AMD R9 270X
Radeon Software Version: 15.11

Initially setting up the displays with Eyefinity was no problem. I just installed a dual monitor stand and reconnected them to my desktop. Now, with both connected, Radeon Software shows this when going to the Eyefinity tab:
"There are not enough displays for AMD Eyefinity. If you are using more than two displays, make sure that your displays are properly connected."

They're both connected the same way they were before, I don't know what I've done wrong. Any help?