Just went through a similar issue with a Vue Utility Connect today. Delivered from Amazon Tuesday May 11, 2021. Called PG&E (California participating utility) the same afternoon. They were able to register the device and see it connected to the meter (the top link led light also lit up), but the device wouldn’t connect to my 2.4ghz network (made sure the pw was correct by connecting my phone, etc). Contacted support and they mentioned the 12 character password limit. So I created a separate wifi ssid with short pw, but that didn’t work either. Stumbled on this post and opened up the ssid with no password and the device connected.
It started on firmware version 1577826911 and was told by support that the device should pick up new firmware and reboot tonight. Expected firmware version is 1607109410 which should fix the wifi issue (and hopefully another issue where it’s just showing 0.000 watts).
For now I left the network open and added a MAC address filter for just that one device so random people don’t start to connect. Will update this tomorrow after the device (hopefully) picks up new firmware and I’m able to connect back to my regular 2.4ghz network (and actually showing data).