Configure Self Service

I have tried to configure the user password self-service service in the UCS domain, apparently I already installed the self service application and Self Service Backend, when I send the token it says that it was sent successfully but this is not the case since it never the mail arrives.
I was reading and it seems that you have to configure an email service and that if I don’t have it configured, apparently you have to configure a new email domain and that is what I don’t want since I already have the business one and it is the one I need to use, it is one which is managed with Workspace.
Has anyone made a configuration similar to what I am proposing?