There is Custom Field Type in Marketing Cloud Account Engagement called CRM User

In Marketing Cloud Account Engagement, "CRM User" is not a selectable data type when creating a custom prospect field. A field functions as a user field for the purpose of assignment when a standard field type (such as Dropdown, Text, or Hidden) is mapped to a user lookup field in the connected CRM (e.g., the OwnerID field in Salesforce). The system recognizes this mapping and allows the field to be used for assignments, but the underlying field type within Account Engagement's settings is not "CRM User."

The statement is false because it incorrectly identifies a functional role of a field as a distinct, selectable data type. While Account Engagement has the concept and functionality of a "user field," this is achieved through mapping a standard field type to a specific kind of CRM field, not by selecting "CRM User" from the type list during field creation. The available types are Text, Number, Date, Dropdown, etc.

1. Salesforce Help Documentation, "Prospect Field Settings Reference." This document provides the definitive list of available field types for prospect fields in Account Engagement. The list includes Text, Number, Date, Dropdown, Radio Button, Checkbox, Textarea (Large Text), Multi-Select, and Hidden. It does not list "CRM User" as a selectable type.

Source: Salesforce Help, Marketing Cloud Account Engagement, "Prospect Field Settings Reference."

2. Salesforce Help Documentation, "Considerations for Creating Custom Fields." This document explains the process for creating a field that functions as a user field. It states, "To create a user field, map a prospect field to a CRM user lookup field. You can then use the field for prospect assignment." This confirms that a user field is created by mapping a standard field, not by selecting a specific "CRM User" type.

Source: Salesforce Help, Marketing Cloud Account Engagement, "Considerations for Creating Custom Fields," section on User Fields.