Can't Configure Azure DevOps Connector in Teams (HTTP ERROR 500)

We are trying to configure the "Azure DevOps" connector in a Teams channel. It has already been added to the channel, so I go to the channel, click the three dots, and click "Connectors."

Then, I click the "Configure" button next to "Azure DevOps":

That then opens a window that says, "To add this connector, sign in to your Azure DevOps account", so I click the "Log in" button.

That then browses the login window to a screen that looks like this:

I click "Continue", and it takes me to a screen to login to my MS account, and I click on my MS account that is currently "Connected to Windows":

After clicking the account, it redirects a few times and ends up showing "https://outlook.office.com" in the window header and nothing but a blank, white screen below:

I've tried this process over and over again, and even had another coworker follow the same process, and none of us can get anything to appear in the window.

I went to the browser version of Teams and did the same process. There was one difference once I got to the blank, white screen bug, which was that the popup window showed a 500 error:

"This page isn’t working

outlook.office.com is currently unable to handle this request.

HTTP ERROR 500"

Anyone have any idea what's going on?