If you're unable to add a user, you will see this error message:
This means the email is already associated with a different Brex account. You can resolve this by choosing one of the following options.
Use an email alias to invite this user
If your bookkeeper manages multiple accounts on Brex and already has an account, they'll need to use an email alias. If they use Gmail or Outlook, you can send a second invite to the same email by adding a plus sign (+) and an additional character(s) after the plus sign, before the domain name:
The email in this format will be treated as a new user at Brex and the user will receive emails addressed to email@example.com in their original email's inbox (firstname.lastname@example.org). By using different email aliases, the bookkeeper can have multiple Brex user accounts with the same email address.
Request to remove the existing email address
Contact Brex Support via live chat
to have the email associated with the account removed.