Same issue exists in my setup
iOS 13.6.1 iPhone 6s Plus
XCode 11.7
macOS 10.15.6 (19G2021)
This issue just started to happen today.
"The current device configuration is unsupported. This iPhone 6s Plus is running iOS 13.6.1 (17G80), which is not supported by Xcode 11.7."
Do we have to upgrade to the beta softwares?