Try going in under the imobilizer instead of going in to diagnostics. I just did a 16
Mazda. I went in through the imobilizer and manually selected the make and model. It
made me waite 7 minutes then added the key.

At first I went in under diagnostics and it asked for the incode. When I went in under
the imobilizer I was able to add the key with no codes.
One word of caution. After I added the key the car would not start with the key that I
just added or the key that was working before I started. I started to panic. I called
support and they told me after adding a key to Mazda's, you have to push the start
button with the key fob the first time that you use the key. I did thid with both keys and
the car ran fine.
It was strange, after adding the key, both key fobs worked the door locks but niether
key would start the car until I used the key fob to push the start button.
Good luck!

I thought you had an IM608. I don't think MK's pull pin codes. You have to get the
code from the dealer or purchase it from a company that provides them.