UA840 SYD-LAX on 7/12, wifi was down the entire flight. unitedwifi.com would keep refreshing ad infinitum and never load. Pax in front of me complained to the FA about it the entire flight (thus saving me from having to do the same)

UA1158 LAX-HNL on 7/13, wifi was shown as available but could not log in to MP account nor access united.com or the United app.