Hi ​@Brian, welcome to the Box Community!

It appears you've signed up for a personal Box account, rather than being added as a managed user under a business account.

Since your personal account is already set up, you'll need to contact your primary admin. They can send you an invitation to join the business account as a managed user.

For the admin, please follow the steps below:

1. After receiving the initial error message “1 user failed to be added,” you can ignore it and click the Save button again. Saving a second time will initiate the invitation process.

2. An email invitation will be sent to the user, along with a notification in their Box account indicating they’ve been invited to join your enterprise account.

3. Once the user accepts the invite, they will be rolled into the enterprise.

For more details, you can refer to this support article:

"1 user failed to be added" Message When Adding Managed User

If your admin needs further assistance adding you as a managed user, please feel free to submit a ticket to our Product Support team.

And of course, don't hesitate to reach out to us for any other questions or concerns.