As of December 13th 2021, Community4U has replaced its login mechanism for all users. Make sure you use https://community.unit4.com/ and update any Community4U related bookmarks.
If you already had a login to Community4U, you will have received an email with new updated credentials to login. This email was sent to you from: Unit4 - Customer Support (firstname.lastname@example.org). If you do not see it, please check your spam folder.
Should you have any questions click here.