Unable to authenticate with GoDaddy managed Office 365 account

[squatto]

My organization manages their Office 365 accounts through GoDaddy. When the auth manager opens, I'm shown this screen:

I enter my email address and click "Next"...

I am then redirected to GoDaddy's auth screen, which doesn't show anything but this:

This may be a GoDaddy issue, but I am guessing it's actually an issue with whatever embedded browser is being used by the java program. I can't drop down either of the menus ("United States - English" or "Contact Us 24/7"), likely because of javascript errors. I simply can't continue, so I'm unable to properly use my repos.

MacBook Pro, Retina, 15-inch, mid-2015
macOS Mojave 10.14.2
GCM installed with brew
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)