@DEP001, Welcome to the HP Support Community!
The custom HP ePrint email address might still be assigned to the printer on another HP account.
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If you have access to the other account, remove the printer from that account, and then add it to your account. Do not turn off Web Services during the transfer or the custom address cannot be used again for six months.
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If you do not have access to the other account, create a new custom email address. You can reuse the previous email address in six months.
For more info, refer to this document.
Hope this helps! Keep me posted.
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KUMAR0307
I am an HP Employee