Messegner not able to detect online facebook contacts

I have been using messenger for facebook chat for a while and it fuctions properly. And suddenly one day, all my contacts are appeared offline in messenger, and the problem persisted from that day on. There are facebook contacts online when I check it on the web, but when I use messenger seconds later, there weren't any contacts online. I have tried to cancel and re-establish the link of my facebook account with my microsoft account for a dozen times already but the problem still exits. My account address is *** Email address is removed for privacy *** , please help.