Hello DEMEERSMAN Yves,
Welcome to Microsoft Q&A! Thanks for posting the question.
I understand that you are facing issue where the 'Share' button is greyed out in Document Intelligence after upgrading models to GA 4.0,
Verify Role-Based Access Control (RBAC) to ensure users have the correct roles, such as Owner or Contributor, assigned in the Azure portal. If access is restricted, you may need to Update Permissions to allow collaboration. The GA 4.0 Changes introduced stricter controls, which may have limited some project-sharing functionalities to enhance security. Additionally, User Role Limitations could prevent certain users from accessing or sharing projects, depending on their assigned roles. Also Check your storage account permission.
kindly refer this document, Project sharing using Document Intelligence Studio.
I hope you understand.
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