I have been having same issue for two days. I’m in the U.S. Brand new wired 2k doorbell. Brand new 16V 30VA transformer. Physical install went fine, and the doorbell passes the voltage / diagnostics tests steps. I get to the point in the app where I enter my wifi router credentials (success), and the doorbell MAC address shows up on my router, and per the router there is PLENTY of signal strength. BUT… then the problems begin… the app churns forever and forever. I have tried factory resets of the doorbell multiple times, I have tried delete / reload the app (iPhone) multiple times. Most of the time I get the “Server Busy (6)” / “Your doorbell fails to connect to server…” message, sometimes I never get the Server Busy message after half an hour. I always keep the iPhone nearby to assure the bluetooth connection is kept. I monitor the wifi router to be sure the doorbell/router wifi connection is kept. One or two times I got what I call a “half way success”… I could see that the doorbell began to kinda sorta function (as evidenced by the doorbell activating with motion + an audible click + the red bar illuminating & going dark when the motion stops) but the app NEVER completes the connection stage and the doorbell never shows up in my devices on the Eufy Security app. It just churns & churns & never gets past the connecting screen. Aargh, this is such a waste of time and so tedious. It smells to me like their servers are overloaded or down and nobody on their end is dealing with it. And support is M-F only, what the heck, most people install these things ON THE WEEKEND. This is very unacceptable. … Update Aug 30: Still not working. Determined that EVERYTHING on my end is working. While I am trying to set up the doorbell,after the wifi connection step, my router clearly indicates the doorbell is connected and the doorbell is trying to communicate with something at IP Address 126.96.36.199:10280 . All attempts to communicate with that IP address time out (i.e. pings, traceroutes). Something wrong on the Eufy end of things. This is MORE THAN ENOUGH INFORMATION FOR EUFY TO FIND THE PROBLEM & FIX IT. … Update Aug 31 (Monday): got email reply from Eufy this morning suggesting I disable 2FA. tried it, it worked.