problem with finalizer in mode 96

Hi everybody, playing with my new finalizer 96, I'm recording my analog piano thru it and I have it connected with toslink cables to the adat inputs of my rme 9652. It works fine with mode 48, but in mode 96 the optical option that is adat12 disappears and I can only choose between tos and thru and then it doesn't gets sinchronized with the rme. Any idea abou it? Thanks a lot!