May be, I guess that may not be a problem with Pie, I even installed 2018 versions of SwiftKey, problem still persists. Don't know what's the root cause.
I guess that's a problem with Android Pie, I faced the same issue on my redmi note 7 pro. However, when i install SwiftKey on to another phone with Android Nougat, it syncs easily. I don't know w...