adding troubleshooting note

Author: Larry Franks

articles/machine-learning/tutorial-create-secure-workspace-template.md

@@ -233,6 +233,16 @@ After the template completes, use the following steps to connect to the DSVM:
 
 1. From the DSVM desktop, start __Microsoft Edge__ and enter `https://ml.azure.com` as the address. Sign in to your Azure subscription, and then select the workspace created by the template. The studio for your workspace is displayed.
 
+## Troubleshooting
+
+### Error: Windows computer name cannot be more than 15 characters long, be entirely numeric, or contain the following characters
+
+This error can occur when the name for the DSVM jump box is greater than 15 characters or includes one of the following characters: `~ ! @ # $ % ^ & * ( ) = + _ [ ] { } \ | ; : . ' " , < > / ?`.
+
+When using the Bicep template, the jump box name is generated programmatically using the prefix value provided to the template. To make sure the name does not exceed 15 characters or contain any invalid characters, use a prefix that is 5 characters or less and do not use any of the following characters in the prefix: `~ ! @ # $ % ^ & * ( ) = + _ [ ] { } \ | ; : . ' " , < > / ?`.
+
+When using the Terraform template, the jump box name is passed using the `dsvm_name` parameter. To avoid this error, use a name that is not greater than 15 characters and does not use any of the following characters as part of the name: `~ ! @ # $ % ^ & * ( ) = + _ [ ] { } \ | ; : . ' " , < > / ?`.
+
 ## Next steps
 
 > [!IMPORTANT]