bbPress.org

WordPress 5.5.1 with Reykjavik theme, bbPre Version 2.6.5. https://help-is.com/

Hello, I am writing from Italy and I ask forgiveness for the bad translation. Registered and activated users are unable to log in, enter a WordPress loop that requires registration details and then return to the home screen without the user, who has filled in everything correctly, being able to enter and modify the profile or create a forum . I can no longer add users manually because bbp tells me they are already registered. I do not know how to do.
Thank you!