I haven't filed a case - just wanted to be sure I wasn't missing something easy before I contacted Google Support. This morning, our network engineer came in (he was out sick yesterday) and told us that he has a rule set up on the SSID which checks the operating system of the device for the word "Chrome" (this is to ensure that only Chromebooks are able to get onto that network). I guess in previous versions, "Chrome" (or "ChromeOS) is in the field that is checked, but in v120 the phrase is not there. Before we move forward to v120, I guess we will need to figure that piece out. I might submit a ticket with Google (or contact our account rep) to inform them of this change and how it affected us.