Create Account doesn't work.

I followed the four steps from the Codelab section (#3 Firebase Authentication) and ran the application in the Simulator.

I tried to create an Account, but when I click the "create account" button, it "clicks" but nothing happens. Firestore Authentication doesn't show a new entry, the create account screen is still visible.

I also tried to use the code from the completed project I downloaded from GitHub. I also compared it to the code I modified from the Codelab - my changes are the same lines found in the completed project.