Ghosts computers in Keychain!

[MDA84]

Dear all,
After a huge crash of my 2017 MBP 15 , I did decide to clean reinstall the system...
However after finishing setup going into mail I saw my mails setup were already here but none of them seems to sync.
I did then delete one by one and prompt message warn me it be « deleted from this Mac and Damien’s IMac »

Issue is that I don’t have any IMac... only explanation would be the IMac i used at work years ago but I do remember having properly des authorized the computer before...

Someone know to get rid of Ghost computer syncing via Keychain ?
Note I did reset keychain on Mac, turned off/on , disabled on all my other iOS devices.... still when logging back on my Mac it shows again ! driving me nuts

 

[DeltaMac]

Keychain is probably not the right place to look.
As soon as you sign in with your AppleID, iCloud will step right in and supply you with your shared settings, etc. Some of that shared information includes passwords, etc, from keychain, but there would be much more than just passwords.

Open your System Preferences, then the iCloud pane.
Click on Account Details. You will need to login to your AppleID account to see those.
Click on the Devices tab, and you will see all devices where you are logged in to iCloud.
If you see a device that you know you don't have now, you can click on that device. You can identify it with some other details. (The name of the device, such as "Damien's iMac" is just a software name that can be changed on that device, and from your example, may not necessarily be an iMac. It's the computer's name, which you can easily change. You could have an iPad that you choose to name "Damien's super-duper computerizer", or whatever other name you can imagine. The iCloud details will show the device model, which will better identify the Mac for you.) If that "Damien's iMac" is absolutely not one that you have now, you can click on the "Remove from Account" button that you can see on the same screen with the device details. But, check the serial number, that Mac may still belong to you. And you are still signed in on that Mac with your AppleID...

 

[MDA84]

Thank you very much for you detailed information I do really appreciate.
Indeed i did check all my devices name in ICloud and all are my iOS devices:
iPhone X
iPhone Se
Apple TV
Apple Watch
MacBook Pro

But none of them have IMac name embedded...
But what I noticed when messing with keychain resetting I do not have the « Ghost comput issue » but as soon I turn on the Keychain in iCloud setting the ghost setting reappears!

When deleting email account then I am asked again to delete from my Mac (MacBook pro) and an Imac which is not linked to my iCloud anymore....

I have seen several post with similar issues , but I believe it have to do with corrupted Keychain data in iCloud