Power Apps User Function 

In Power Apps, the User() function is a valuable tool for retrieving information about the current user. This function can be particularly useful in situations where you want to personalize the app experience or implement certain features based on the user's details. When you use the User() function, it returns a record containing three pieces of information: Email, FullName, and Image. These attributes provide the user's email address, full name, and a link to the user's profile picture, respectively. But there's a new 4th property now, EntraID! This is a GUID value that’s unique for each user in your Micrsoft tenant and is crucial for contacting APIs that use this information.
An interesting aspect of the User() function is its ability to create a more engaging and personalized user experience. For instance, you can use this function to greet the user by name on the app's home screen or to automatically fill in the user's details in forms, saving time and improving the user-friendliness of your app. Remember, though, that the User() function only provides information about the user as registered in the Microsoft 365 environment, so its use is limited to apps within that ecosystem.
-Darren Neese with PowerApps Tutorial
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