OS X Dropbox won't accept 2 factor verification code

[mcv]

Somehow Dropbox on my Mac lost access to my account, so my files aren't syncing anymore. Possibly because I upgraded to a new version of OS X (I'm now on Sierra).

Dropbox is still installed, however. So from the dropbox icon in the top bar I open "Set Up Dropbox", enter email and password, and it sends a verification code to my phone. All is fine so far. But when I enter that varification code into the setup tool, it complains: "Invalid code". It is the exact code Dropbox texted me. I tried this half a dozen times with new codes. It's no typo.

Dropbox just doesn't recognize its own verification code.

What could cause this? And how do I get Dropbox to work again?

[UnreachableCode]

I tried this and still faced this issue. I've now been locked out of my account for 24 hours.

[Jane]

Hey @UnreachableCode, could you elaborate a bit on the steps you’ve already tried on your end, so as to make sure I’m following-up with you correctly? Have you recently upgraded your OS, as originally described on this post? Are you seeing the "Invalid code" error message, as the OP described us? 

I appreciate the time you’re devoting to clarify matters for me & I’ll be awaiting your next message!