Understanding Unified Individual Profile:
The unified individual profile combines data from multiple sources to create a comprehensive view of each customer.
Reference: Salesforce Unified Profile Documentation
Issue with Latest Email Address:
If the latest email address is not being stored, the reconciliation rules, which determine how data from different sources is combined and updated, may be incorrectly configured.
Reference: Salesforce Data Reconciliation Overview
Reconciliation Rules:
These rules define which data source has priority and how conflicts are resolved when combining data.
Ensuring that these rules are correctly configured is essential for maintaining accurate and up-to-date profiles.
Reference: Salesforce Reconciliation Rules Guide
Steps to Troubleshoot:
Navigate to the reconciliation rules settings in Salesforce Data Cloud.
Review the current rules to ensure the correct handling of email addresses.
Verify that the rules prioritize the most recent data and handle duplicates appropriately.
Reference: Salesforce Reconciliation Rules Configuration Documentation

Explanation
A Data Model Object (DMO) that inherits the name, shape, and semantics of the reference object is called a Standard DMO. A reference object is a predefined object in the Data Cloud data model that represents a common entity or concept, such as Individual, Order, or Product. A Standard DMO is a copy of a reference object that you can use to ingest data from a specific source without modifying the original reference object. A Standard DMO has the same fieldsand relationships as the reference object, but you can add custom fields or relationships to it if needed. References: Data Model Objects

This is the correct formula to display the value of the raw data column of "RetailPrice" plus an additional 5 percent. The formula uses the sourceField function to access the raw data column, and then multiplies it by 1.05 to add 5 percent. The formula is case-sensitive, so the column name must match exactly with the raw data column name. Reference: [Formula Editor], [sourceField Function]

Value suggestion is a feature of Data Cloud that allows you to identify and select text attributes from a picklist of options. You can use value suggestion to standardize values across different data sources and improve data quality. References:
https://help.salesforce.com/s/articleView?id=sf.c360_a_data_cloud_value_suggestion.htm&type=5