Configure KeyCloak with SAML single sign-on for Atlassian Data Center applications

Hi All.
I have configured KeyCloak for Atlassian with the SAML SSO-plugin, which works fine.
Now we have to migrate to the datacenter-version of all our Atlassian-applications, which has a built-in (and free!) ‘SAML single sign-on for Atlassian Data Center applications’.
Is there anyone who has experience with this? I cannot get it working 'till now. I’ve tried the open-id as well as the SAML-option.
I would appreciate it very much if someone can help me with this.
Thanks in advance!

Hi All.
I solved this issue. So no help needed anymore.