Passat b8 2015 can read with OBDSTAR X300M, but not write e say to use real key but car its keyless shown as below. Then followed with solution.
Take out the battery from key. After that, put the hey near start button and press start. Try to find the correct position. Its work…
Finally, it works.
Thanks to @mobel (DK forum)
Edit by Laurance from obdexpress.co.uk