An email address can only be associated with one Perdoo account.
If the user you are trying to add already has their own account, the previous account must be deleted in order to link the same email address with the company account.
* NOTE: Unfortunately it's not possible to merge information from one account into another account. Adding the user will not carry over the information associated with it. The accounts are separate and there's no way to connect information from one account to another.
Contact our Support team via the in-app chat at the bottom-right of your screen, or email email@example.com from the account you want deleted, and we'll be happy to help.