More info about what the platform migration is all about. You can read more here:
To answer your question, one of the things they mentioned in their message is this:
This means the friends list you had before the migration is gone. It sucks but I am only assuming that they will give a new option to add friends in a list once the migration is over. Seeing the fact that the forum is still glitching up a lot and not all the stuff that was supposed to migrate hasn’t been migrated yet, we will just have to wait and see. Maybe this is not the answer you hoped for, but it is what it is.
Otherwise do like me, don’t have a LPU membership and hang out anyways. Saves a lot of frustration