@martial First let me give you a more general answer to your request. FOG came to life when every machine still had an internal ethernet adapter - I know this sounds a bit like dinosaurs roaring but hey - so the MAC address was used as unique identifier of machines.Over the years more and more devices without ethernet came out and we had a first go at switching to a different unique identifier that would be machine specific but not (only) using its MAC address. You can find discussions on this topic in the forums. The end of the story as of now is that we were running into major issues with the other unique identifier and decided to stay with the MAC address for now. It’s a huge change within FOG and we don’t seem to have enough time to go ahead with this change - development, testing, user support… It’s all a big story.
Ok, enough of that, back to the point. Re-using the same ethernet adapter (MAC address) is essentially breaking FOGs logic of identifying machines. I am not sure but I think most people using FOG this way don’t use the fog-client and therefore don’t run into the same issue as you are. Imaging usually works just fine.
I am not saying that AD join is impossible but I have not looked into it myself to have a solution for you at hand. There might be other tools around that can be used to make Windows join a Domain on first boot or something like that.
now I have problems with the security token and repeated mac address
You might also want to take a look at the database entries to see why you seem to have duplicate MAC entries in there. As well please share the full client log so we can have a look. Possibly it’s something else causing the problem.