User Profile

I've added my iPhone's correct UDID in the "Devices" section in Apple Developer account, and I created a Development Profile. I then downloaded it (as a .mobileprovision file) and am trying to add it to my connected iPhone via XCode. I'm getting this error message: Failed to install one or more provisioning profiles on the device. Please ensure the provisioning profile is configured to this device. If not, please try to regenerate a new profile. I have ensured the provisioning profile is configured to this device and have tried regenerating it. Same result. My iPhone has "Developer Mode" turned on. How do I troubleshoot this further?