This guide takes you from first login to a created stream. You do not need a separate IRL.com.de account – on first visit, OAuth with Twitch or Kick is enough and a panel account is created automatically. You can later set a password in your profile to also sign in with email/username and password.
If something fails, check status.irl.com.de first. Create tickets in the panel under Support Tickets. When emailing support, the sender address must match the email stored in your profile.