The AES 256 Encryption standard in the Cryptography componant produces an empty string when called. I have tried adding a key manually (24 Char length) and have also generated one using the inbuilt generate function. However, the output is always an empty string.
I tried resetting the connection, the output still is an empty string. I created a new project and replicated your setup, just for testing, but the output hasn’t changed.
P.S: AES 128 Works fine. Problem seems to be only with AES 256