Originally Posted by
witlesspax
Well, you'd only be able to enter the F lounge if you were flying in F, so isn't *G irrelevant? I believe to enter the LH group F lounges you need to be in F on the LH group as well, which may be the explanation in this case.
With perhaps a few exceptions, the LH lounge at FRA/MUC is the private domain for confirmed LH First Class Ticket Holders & and presumably Hon Circle Members. Flying TG-First FRA/BKK had me (despite best efforts) rerouted to participating Business Class Lounges in the Main Terminal Building.