Hi Jorgen and Lonleysurvior, sorry for the late follow up...
ClientLocation.log shows that the client already part of the correct forest and domain. It is in the same boundary like others clients who managed to find the site code.
ClientIDManagerStartup.log shows Failed to refresh site code. Error: 0x8000ffff, got any insight about this error code? Tried googled it but looks like a very generic error code.
I'm sure that all basic task like extend AD schema, etc, has been checklisted. Because this issue not happens on all clients, only some of them.
In my boundary group configuration I have my DP listed, and have the "use this boundary group for site assignment" options disabled. Should I change one of these options and what should I change?