Universal Login page fails to load

We have a classic (I believe) universal login page that has been working fine. We wanted to add Datadog RUM logging, so I did n npm install of @datadog/browser-rum. However, when I import the module (and do nothing with it), the chunk of code fails to load and returns a 404 - even though the chunk of code is located where it is told to look. I have been unable to find any logs related to this. How can I determine what the root cause is?

Issue was unrelated.