I started a new iOS app project in Xcode, and as usual, selected my personal signing team, and selected "Automatically manage signing".
However, instead of it creating the appropriate provisioning profile, I get the following error: "Communication with Apple failed / The response data was not a valid plist."
Clicking Try Again makes no difference, nor does restarting Xcode, or removing and readding my developer account in the preferences.
Selecting "Manage Certificates..." in the account preferences and selecting "iOS development" results in a modal with the same error, or sometimes the error "You already have a current iOS Development certificate or a pending certificate request."
This behaviour is identical in Xcode 8.2 and Xcode 8.3 Beta, both latest versions.
This bug has made it impossible to test my app on a device.