Can't logon to new T58W

[toddrf]

We just purchased a T58W for use with Zoom. Using zero-touch provisioning, we got it onto the network and configured as a common area phone. We also purchased an EXP50 expansion module and it is also connected. One way to configure the buttons on the expansion module is to logon onto the base phone. However, when I try to browse to the phone's IP, I get a "404 Not Found" error with "nginx" below. I wonder if there is some other kind of provisioning step that I'm missing, but I'm not finding much from my internet searches. Any thoughts on this?