maybe if you try to claim in US property is different, but in europe most likely the claim is handled by milan office and your are out of luck.
I will be very surprised if somebody is approved from that office.
Recently i find the a room for 50 eur when the bw site was over 100 euro,
and they made up same excuse for rejecting the claim.
The bw guarantee is total scam,
if you want a room in the hotel you are looking for just use the site with the lowest rate and dont count on the BRG.
I will be happy just to receive the lowest rate and let say 20-25% off,
but they offer 100 $ because they now , thy will reject almost all the claims.