Ring doorbell connecting to existing chime

Hi, I have recently purchased a ring doorbell (I have it all working which is good) but I have one issue with connection to my existing chime. I have swapped over both connections to the back of the doorbell with no success. I have seen some videos which suggest you need a diode between the screws in order for this to work ? Is this the case The model i have is ring 2nd gen Many thanks