BACKUP, the reason why you are an issue at the IKS66 website, is because it looks like you are not using the correct first 6 digits in for the MAC addy being entered there.
The first 6 digits for Kodi with Stalker, would be 00:1A:78 and then followed by the last 6 digits of the MAC addy you have generated.
By trying to substitute them first 6 digits, was the cause of the error. They always have to be 00:1A:78 for Stalker applications.
What is shown there now for a MAC should be the correct one, with the last 6 digits added from the addy you gave me.