after updating J3.10.1 Seblod 3.21.3, it wa not possible to register in my site. I resolved this problem with creating a link menu
through seblod registration form, and put this link as parameter in seblod
integration / user / configuration.
This doesn't wok with a standard Joomla registration link.
The problem now is that redirection after registration (which is a parameter of connexion module I think) works no more.