Los valores de user_id no se pueden ver en la interfaz de usuario de AMC ni descargarse de AMC.

This statement is true because Amazon Marketing Cloud (AMC) is designed with privacy at its core. While AMC allows you to analyze aggregated, anonymized data to gain insights into campaign performance and customer behavior, it does not expose individual user identifiers (like userid) in its user interface or through direct downloads. This ensures that user privacy is maintained, aligning with data protection regulations. You can work with these identifiers internally within your queries for matching and aggregation, but the raw, individual userid values are not viewable or extractable as a security measure.