Alright i am sure that a bunch of you are still having problems getting into the Private Forums for the Xbox Live Preview Program.
The error "Group Not Found" is a pain i know and can be very frustrating right now. So here is a little help for you guys that do not know what might be going on. There is still a little bit of bugs going on so just try and be patient.
Here are the steps that need to be taken
1. Make a post here to make sure your presence is known
2. Check and make sure the gamertag you submitted is correct.
3. Even if it is correct i suggest to resubmit your gamertag here connect.microsoft
4. Now play the waiting game for a few hours
note* it says that you will have to wait UP TO 5 days it does not take this long
These are the steps that i took and they worked for me good luck to everyone and hope to see you guys over in the Private Forums
if you guys are still having trouble with this i suggest that you contact the people at connect.microsoft.com the people at XboxSupport can NOT help you with this problem.