Expired token for Email/Password Authentication us

Question

I have a mongodb altas cluster on cloud.mongodb.com.

As per the instructions in https://docs.mongodb.com/stitch/auth/email-auth/ I was able to register an email/password pair. About 12 hours later I received the confirmation email. I visited the link in the confirmation email yet 12 hours later. Chrome browser developer tools tells me that the server returned HTTP 400 and body:

{"error": "the token is expired or invalid"}

I think the token has expired, but when I tried to register the same email again, the server returned HTTP 409 and body:

{"error": "name already in use"}

So if the token expires, is there a way I can register it again?