I had a situation where bixby wouldnt work. I was getting the common “i cant complete your request, oops something went wrong” messages. After a lot of research and testing i found it was because I was connected to the wifi where i work. I turned off the wifi and it worked immediately. Somehow bixby’s connection was being blocked by the wifi. When i turned wifi back on it stopped working again. Turned wifi off it again worked. Hope this helps someone out there.