Is this sure? I can't see it in the adjudicator, but i remember someone saying in the forum on WebDip, the following:
While you can suport move into an unreachable coast, you cannot support hold an unreachable coast.
It's like, for the support move, each one attacks the defending army from separate sides, 1st the supporting fleet wakens the defender, then the moving fleet moves in.
However, for support hold, it's like both units join forces, but since the supporting fleet cannot reach the supported fleet, it can't s hold.
I'd want further confirmation that this is not a bug. Thx