Hi @julien deroche Thanks for your posting in Q&A.
Currently this is by design, normally moving a group assignment or adding an exclude group(equivalent to stopping the installation process) and then assigning a group to the uninstall setting. Save and restart, after that the app will be uninstalled. The process should be streamlined in the future.
https://learn.microsoft.com/en-us/mem/intune/apps/apps-inc-exl-assignments
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