In PowerApps we can use the formula such as "User (). Image" to retrieve the user's photos, which seems to be getting information from Azure AD. However, UserPhoto of the Office 365 user connector gets photos that can be obtained with Office 365 tenants.
Although PowerApps is a service included in Office 365, it is very confusing that different pictures can be acquired.
The documents of the User function is confusing us.
I request the improvement of the description more specifically, such as "User() function is getting user photo from Azure AD".