New UC Davis account stuck in Duo enrollment loop

Hi there, I recently got a new UC Davis account through TAF, and I’m trying to set up Duo.

The problem is that when I go to the Duo setup / device manager page, it keeps redirecting me to the UC Davis CAS login page. After I enter my username and password, it sometimes says I’ve successfully logged out, and then if I try again it says it doesn’t know where to redirect me. Eventually I get:

So I’m basically stuck in a loop where I need Duo, but I can’t complete Duo enrollment.

Since this is a newly created TAF account, I’m wondering whether this is normal for a new account, or whether something is broken and I need to contact IT.

Has anyone run into this before?