Hi @Nick Loenders ,
Based on the information provided, it is possible that the child hubs have not been properly associated with the parent hub. Additionally, it is important to note that navigational links to associated hubs are not automatically updated when there are changes to hub associations in the SharePoint admin center.
Here are some steps you can try to resolve the issue:
- Go to the SharePoint admin center and confirm that the child hubs have been properly associated with the parent hub.
- Check the hub navigation settings to ensure that the "Associated child hubs" option is selected and that the links have been properly added.
- If the issue persists, try removing the child hubs from the parent hub and then re-associating them.
For your references: Associate a SharePoint hub site to another hub to connect search experiences
How should I organize my hub site?
Planning your SharePoint hub sites
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