@Gaby von Knobelsdorff Thanks for posting in our Q&A. From the information you provided, I notice it is non-English. Currently, for Q&A, only English is the supported language. Thanks for your understanding.
To avoid misunderstanding between us, I recommend to post our replies in English to go further. However, if you prefer your native support, we can also consider opening case via the steps in the following link to get help:
https://learn.microsoft.com/en-us/mem/get-support
Here, I have done a translation, I find that we have a new chairman and we want to assign Intune administrative permission to the new chairman. If there is any misunderstanding, feel free to let us know.
To grant administrative permission to Intune, we can grant Global administrator role or Intune administrator role to the new chairman. Please see more details in the following link:
Select Assigned roles > Add assignments > Role
https://learn.microsoft.com/en-us/mem/intune/fundamentals/users-add
Hope it can help
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.