I am trying to copy iCloud web form passwords to a local keychain as per this tutorial.
An error has occurred. Unable to add an item to the current keychain. One o more parameters passed to a function were not valid. [Cancel] [ Ok ]
When copying and pasting from login, it works successfully so the problem must be related to iCloud Keychains.
Other people have encountered this problem:
but most interesting is this post
Contacted Apple Support. They couldn't figure out so an engineer is gonna take a look at log files.