End-to-end encryption, also known as E2EE, means that messages are scrambled so that only the sender and recipient can see them. If anyone else intercepts the message, all they will see is a garble that can't be unscrambled without the key
Congress's Shashi Tharoor, Trinamool Congress's Mahua Moitra, Shiv Sena (UBT)'s Priyanka Chaturvedi, and AAP's Raghav Chadha shared screenshots of the said messages from Apple.