Can't Change My Primary Email Address after Deleting a Second Account

I had two Adobe accounts with two different primary emails. I successfully deleted one of the accounts that used the primary email of ABC for example.

On my remaining account, I deleted my secondary email that was also ABC.

So now I should be able to change the primary email address of my remaining account to ABC. No go. I keep getting an error message that states the ABC email address is being used somewhere else, when in fact, I have cleared all uses of the ABC email. Do I need to wait a specific period of time before changing the primary email on my remaining account?

Please help as the primary email (XYZ for example) that is used on my remaining account will no longer be valid soon.

Thanks,

Tom