Problem with Custom Email Domain

I'm trying to create a custom domain email in iCloud, but an error message appears stating that the email cannot be created. As the email was already associated with an AppleID, the system did not allow me to associate the email with my account. So I deleted the AppleID with the associated email, but it still won't allow it. Does anyone know how I can do this? Is there any way to clear this email on Apple's database?

Problem with Custom Email Domain
 
 
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