AVD Environment- FSLogix Profile Login Failure – Write Protected Error

Hi,

We are currently facing an issue with FSLogix user profiles in our environment and would appreciate your assistance in identifying and resolving the problem.

Issue Description:
Users are unable to log in successfully, and we are encountering the following error message:

"No Create access → The media is write protected."

Environment Details:

• Session Hosts: Microsoft Entra joined
• Users: Hybrid identities
• Profile Storage: Azure File Share
• Authentication Method: Identity-based access using Microsoft Entra Kerberos

Configuration Details:

• We have assigned the FSLogix user group the role "Storage File Data SMB Share Contributor" on the Azure file share.
• Registry entry for Kerberose Ticket is also created.
• NTFS permissions have been configured via Azure Portal (Manage Access), granting Modify permissions to the FSLogix profile users on the file share folder.
• We can see that user profiles and corresponding VHDX files are being created successfully during login attempts.

Problem Statement:
Despite the successful creation of profiles and VHDX files, users are still unable to log in, and the error mentioned above persists.

We would like your guidance on:

1. Possible causes for the "write protected" error despite correct role and NTFS permissions.
2. Any additional configurations or validations required for FSLogix with Entra Kerberos authentication.
3. Recommended troubleshooting steps or logs we should review to isolate the issue.

Please let us know if you need any additional logs, screenshots, or configuration details from our end.

Looking forward to your support.

Best regards,
Ravi Yadav