You are embedding a Power Apps visual in a Power BI dashboard.

Power BI uses Azure Active Directory (AAD) to authenticate users who sign in to the Power BI service, and in turn, uses the Power BI login credentials whenever a user attempts to access resources that require authentication. Users sign in to the Power BI service using the email address used to establish their Power BI account; Power BI uses that login email as the effective username, which is passed to resources whenever a user attempts to connect to data. The effective username is then mapped to a User Principal Name (UPN) and resolved to the associated Windows domain account, against which authentication is applied.