I have deleted the staff account and created a new one for the same person using different email, then sent the invitation link to my staff to sign up. But it doesn’t work — it says the account already exists. What should I do?
Sorry, I don’t understand your issue here.
FYI, an employee account cannot be deleted, only employee RECORD can be deleted.
I see, but why I cannot change employee new email address since they forgot their old email’s password.
Can I send new invitation link for them to sign up using new email address?
Yes, you can Re-invite the employee to sign up with another email address.
Just go back to the employee’s web account via Employee->Web Account->Enabled, then select the employee and click the Orange re-invite button.