@Thierry HG , For ADE enrollment, we can follow the steps in the following article.
https://video2.skills-academy.com/en-us/mem/intune/enrollment/device-enrollment-program-enroll-ios
However, if all the required steps are done but the issue still persists, please check the enrollment profile status to see if the profile is applied successfully.
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.