Hello,
It was the first thing I did, to check from my base if the user existed, but it was not the case.
And in this case, why when i disable the recaptcha the issue disappear ? If i have existing user in my databse, i should have the same message.
But, i test again by precaution to register random user, with random mail address (to be sure that this user not existing in my database), and i have same issue.
Regards,