Also in regards to the UN aspect, it should be remembered that observer status has been given to various groups, so it is possible that an individual actually is there as a recognized observer.
Again, the problem there is that the Federation is a state
in its own right, not an IGO
. In point of fact, the Federation is just what its name implies -- a federation
. It's probably fair to say that it grants a lot more autonomy to its member polities than, say, the US or Canada does today, but the idea of an "observer" member of a federation is legal nonsense.