The ciphertext refers to a customer master key that does not exist, does not exist in this region, or you are not allowed to access.

Raise code

raise InvalidCiphertextException()

    aad = _serialize_encryption_context(encryption_context=encryption_context)

    try:
        key = master_keys[ciphertext.key_id]
    except KeyError:
        raise AccessDeniedException(
            "The ciphertext refers to a customer master key that does not exist, "
            "does not exist in this region, or you are not allowed to access."
        )

    try:
        decryptor = Cipher(
            algorithms.AES(key.key_material),