How to delete an Apple ID passkey after changing the Apple ID

I once changed my Apple ID. Before changing it, I had set up a passkey for the Apple ID website. After changing my Apple ID, whenever I log in to Apple ID, it still shows my previous Apple ID. Additionally, the passkey for the Apple ID website is not present in my 'Passwords' app, so I am unable to delete it.

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How to delete an Apple ID passkey after changing the Apple ID
 
 
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