Starting around 13:00 pacific today, we've been getting elevated levels of errors trying to verify recaptcha from our back-end.  The error we're getting back is:

{ "success": false, "error-codes": [ "timeout-or-duplicate" ]}

Here's a screenshot of stdout from our server showing instaces of "recaptcha":

As far as I can tell, we haven't changed anything that would have caused this.

The only thing I can think of is converting from a legacy to enterprise key -- that was done last Monday as a direct result of this -- https://www.googlecloudcommunity.com/gc/reCAPTCHA/ReCaptcha-Test-Key-stopped-working/m-p/860259#M346 

According to the UI of recaptcha, we're seeing elevated levels of "low risk" hits, but nothing to indicate our users are getting errors.  It's pretty much all going into error right now.

I'm not going to share our order numbers here, but the last successful order we had in Canada was 13:05 -- in that same time period, we've seen USA orders unaffected.

Please advise.

EDIT --  Looks like this post still isn't visible, so I can't add a reply to it.

We ended up removing recaptcha from our site completely. 

Will circle back on Monday morning to see what the status is.