Thanks for your question. Please consider following the markdown formatting guide for future logs and config snippets.
Unrelated to your question, your Icinga 2 version is a bit outdated, please consider updating.
The daemon validation log you have posted in your first comment contains lots of warnings about non matching apply rules. For example:
[2024-07-22 12:29:03 +0100] warning/ApplyRule: Apply rule ‘Apply Parent Core a06-ss02-ab02-30’ (in /var/lib/icinga2/api/packages/director/8ed000bb-1196-4de3-ab5f-d4ce0c711250/zones.d/director-global/dependency_apply.conf: 17:1-17:61) for type ‘Dependency’ does not match anywhere!
It seems like you have defined services which are not properly applied to hosts. As the file path in the logs implies the usage of the Icinga Director, please refer to Service Apply for Example - Icinga Director.
I hope this will help you out. Otherwise, please consider sharing the Director configuration in question.