When following the instructions to setup a Proxmox VM (https://docs.vyos.io/en/latest/installation/virtual/proxmox.html), I cannot figure out what the initial default vyos password is. Trying the usual vyos fails, along with every other guess I have come up with. Adding a serial port and using "qm terminal" to connect lets me reset the password for the vyos user and get in, so it is easy enough to work around... but seemed worth mentioning?
Also, trying to use the Proxmox web console for the new VM lets me select the "reset password" boot option, but it doesn't work - it seems to time out with an empty screen and eventually reboot again. The serial port connection and using "qm terminal <vmid>" from the Proxmox command line allowed me to do the password reset, though.
Anyway, probably a moot point given the move toward a non-default generated password, but in case this is important or helpful to anyone I wanted to report what I found. (I checked in 1.4.3 and 1.4.4)