A retriable error (such as network failure) occurred on the browser.
Could easily be simulated by an attacker.
Dupe
The user verification had already been seen.
Expired
The user verification token had expired.
Malformed
The provided user verification token was malformed.
Missing
The user verification token was not present. It is a required input.
SiteMismatch
The user verification token did not match the provided site key.
This may be a configuration error (e.g. development keys used in
production) or end users trying to use verification tokens from other
sites.