'Email has already been used' error after deleting pending user

[danieljtvthorn]

I am attempting to update the email address associated with a license on one of my site's subaccounts. Initially, I created a new user account associated with the new email address, and deactivated + transferred the old account's license to the new account. However, I forgot that there was an upcoming webinar still scheduled on the old account, so I deleted the pending user and returned the license to the old account.

I then remembered that I could simply update the account's sign-in email to the new email address in user management. However, when I enter the new email address and complete the captcha, I receive an error message saying that "email 'xxxxx' has already been used."

I can no longer see an account associated with that email under neither users nor pending users in the subaccount, and I can confirm that the email is not in use among any other subaccounts nor our main Zoom account.

Is my deleted invitation to that email address still cached somewhere, and if so, can it be removed so I can update the relevant accounts to their new email addresses?

Thank you for your help.