Posting here for people who may come later...
After having some issues with channels not streaming, I removed Hulu as a source, and went to re-add it. That was a mistake. Try to avoid that, even if it means you wait several days to see if a new beta resolves the issue.
I could not add Hulu as a source. I received the 2FA emails, with no ability to authenticate. After trying several things, several times, none of it working, I will tell you how I got going again.
I started a chat with Hulu support, and had to confirm all my account info. I informed them I had a computer that I was trying to use TVE, but that computer cannot use 2FA, so I needed to authenticate with name and password only. They tried to start troubleshooting, asking about what browser I was using,m but I redirected them saying "This computer cannot use 2FA, no amount of troubleshooting the browser or connection will change that. I need to authenticate this computer with username and password only." They escalated support and came back and said to try again. I went to my Hulu account, to "Manage Devices", and removed my web browser that was trying to authenticate. I then added the source to Channels .... and it worked.
Evidently, by doing this, you can have them temporarily bypass 2FA to get a device added to the account. I wish they still allowed disabling 2FA in your account so this extra headache was no necessary.
Hopefully this helped someone!