Upadate docusign user ID

I'm on a project where we had already configured docusign and it worked; the project was put on hold a month ago. I took the hands and then I have to change the user id because it no longer has a license. when I change the user id to use another that has a trial license I get an error and when I go to authenticate I do not have access. what do you advise me to do? the only thing I want to change is the user ID for the rest it works.