What is KeychainPersistentIdentifierCanaryPersistentIdentifier ???

Canary is likely a reference to a “canary in a coal mine.” If the canary dies, you know something is wrong. That password is probably something that if missing flags iCloud that something is wrong.

And, yes, I do have that entry.

IMHO - this is a System keychain / certificate and should be left alone

XopmoH wrote:

I REMOVED ALL OTHER PASSWORDS AND CERTIFICATES FROM THE KEYCHAIN WITHOUT PROBLEMS1. , only deleting this password does not work.

For these reasons, I conclude that it may be a malware. Therefore, I want to delete this key! I understand everything, of course, but I was able to delete all other keys and passwords without any problems, even those used for authorization in appleid/icloud (I had to re-enter the accounts), but this one cannot! For example, do you have this password, if it is a system password? Help me please!

It is too late for that. Just a few seconds ago, I posted this in your other thread. I honestly didn't expect to see my prediction come true so soon.

Yes. You have most definitely, absolutely been hacked. And hacked hard. However, they hacked your mind. They made you think your computer was hacked when it was really just you. Now you have compromised the security of your computer and made it vulnerable to hacking. You've done the hacker's job for them.

My recommendation is to stop doing whatever you have been doing on the internet. Erase your hard drive and reinstall the operating system.