Super weird to me that Dropbox has told Dropbox Sign customers to "delete your existing entry and then reset it" if they use app-based MFA. I have never seen "delete your MFA and create new tokens" in post-compromise account hygiene advice before.
I suspect two things:
1.) Dropbox was storing plain text MFA seeds right next to their password hashes
2.) We're going to hear a lot more about this soon.
