Hello again,
Well, I think I solved my problem, I checked "COM 1" on the radio panel of my Pipistrel Panthera and now I have Xp11's ATIS which launches. So when I go back to UNICOM, I have to manually reconnect to TS but still....
Another odd thing, when I write a message under UNICOM, it appears as a COM 1 callsign and not the callsign that I entered in the flight plan (I fly under immat: FGSYR)
Any idea?