Decrypting selling partner api reports

Question

I am trying to decrypt selling partner api reports but while decrypting I am getting this error near decipher.final() [Node] Error: error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length. The api returns the key, iv and the url of the report. Selling Partner api reference

I tried the solutions mentioned in other threads but still facing issues. I checked the length of both key and iv and it is 32 and 16 respectively.

Here is the code:

var AESCrypt: any = {
            decrypt: function (cryptkey: any, iv: any, encryptdata: any) {
                var decipher = crypto.createDecipheriv('aes-256-cbc', cryptkey, iv);
                // decipher.setAutoPadding(true);
                return Buffer.concat([
                    decipher.update(encryptdata),
                    decipher.final()
                ]);
            }}
            
            
  const res = await processRequest({
        url: details.url                                                                                                     
    });
    
    let encrypted_buffer = Buffer.from(res);
    const key = Buffer.from(details.encryptionDetails.key, "base64");
    const iv = Buffer.from(details.encryptionDetails.initializationVector, "base64");
    const decryptedBuff = AESCrypt.decrypt(key, iv, encrypted_buffer);
    console.log(decryptedBuff);