When I try to make any changes to iClould, from OS X 10.11 (15A178w), the checkboxes uncheck themselves.
This is what I get in my error console:
6/21/15 10:57:17.890 AM com.apple.preferences.icloud.remoteservice[500]: [AOSAccounts] : ___ZN15ServiceProvider21SetEnabledOnACAccountEbb18MMSetEnableOptions_block_invoke Error updating account: @, error: Error Domain=com.apple.accounts Code=5 "A iCloud account already exists. Only a single iCloud account is allowed to be saved." UserInfo=0x7fa9c1540d70 {NSLocalizedDescription=A iCloud account already exists. Only a single iCloud account is allowed to be saved.}
I only have one account that I know of.
However accountsd states otherwise.
6/21/15 10:57:13.053 AM accountsd[330]: [AOSAccounts] : [iCloudIDNotificationPlugin] -[iCloudIDNotificationPlugin canSaveAccount:inStore:] : Returning false. Same DSID found. Found duplicate for account *my email* (*some guid*) which is *my email* (*different guid*)