This error typically means that the user you are trying to associate with the fund already exists in your organization’s system, even if you did not make any changes to user assignments. This is a known issue and may require support intervention to resolve. For assistance, please visit the Decile Hub support page and report the issue with details and your screenshot: [Decile Hub Support](https://decilehub.com/base/8-hub_support/22673-error-updating-fund-details-account-organization-users-user-has-already-been-taken).