Thank you for your post and I apologize for the delayed response!
From your issue, I understand that your VNET configuration wasn't fully migrated from the Classic VNET model to the Resource Manager VNET model. However, since Azure AD Domain Services (Azure AD DS) classic VNET deployments were retired on March 1, 2023, your domain moved into a Suspended state.
When our support team shared the article regarding suspended domains, did you run into any error messages or issues when following the troubleshooting steps?
To restore the health of a managed domain that's in the Suspended state, complete the following steps:
- In the Azure portal, search for and select Domain services.
- Choose your managed domain from the list, such as aaddscontoso.com, then select Health.
- Select the alert, such as AADDS503 or AADDS504, depending on the cause of suspension.
- Choose the resolution link that's provided in the alert and follow the steps to resolve it.
After you resolve alerts when the managed domain is in the Suspended state, open an Azure support request to return to a healthy state. If there's a backup less than 30 days old, Azure support can restore the managed domain.
For more info - View the health status
- Since you have an open Support Request would you be able to share the Support Request number so I can take a closer look into your issue?
- If you're running into any error messages when following the troubleshooting steps, can you share a screenshot of what you're seeing?
If you have any other questions, please let me know. Thank you for your time and patience throughout this issue.