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To prevent Azure.Identity.CredentialUnavailableException when starting up from scratch, you can follow these steps:

1. Ensure that your Azure subscription is active and in good standing.

2. Make sure you have the correct credentials to access your subscription. This includes your Azure account email address, password, and any other authentication details that may be required.

3. Check that your firewall settings and network security groups are configured properly to allow traffic to and from Azure resources.

4. Make sure that you have the latest version of the Azure SDK installed on your machine.

5. Verify that the resources you're trying to access are available and properly configured. This includes Azure Virtual Machines, Azure sql database, Azure Storage account etc.

6. Review the error message carefully to determine the root cause of the problem. Azure.Identity.CredentialUnavailableException generally indicates that you don't have the necessary credentials to access the resource.

7. Double-check your code and configuration settings for any errors or misconfigurations that may be causing the issue.

8. If all else fails, consider reaching out to Microsoft support for assistance. They can help you troubleshoot the issue and get your Azure resources up and running again.