Well, Xenial is getting the new PackageKit which doesn't support additional plug-ins, so clicks will not be installable there, no matter what is done.
There is nothing unity-scope-click can do about the configuration of packagekit, either. If you want to install clicks on a traditional PC, you will need to alter the the configuration (or install whatever is included on the phone images, which performs that alteration for you).
Why did you mark this as Invalid in click and re-assign to the scope? If any package should do anything about this, it is click itself, not the scope.
Well, Xenial is getting the new PackageKit which doesn't support additional plug-ins, so clicks will not be installable there, no matter what is done.
There is nothing unity-scope-click can do about the configuration of packagekit, either. If you want to install clicks on a traditional PC, you will need to alter the the configuration (or install whatever is included on the phone images, which performs that alteration for you).
Why did you mark this as Invalid in click and re-assign to the scope? If any package should do anything about this, it is click itself, not the scope.