Some workitem fields are missing Post Azure DevOps Migration to Cloud

How about this:

1. Audit Missing Fields

Use PowerShell or REST API to compare field definitions between source and target:

# Example: List fields in a work item type
Get-WorkItemType -Project "YourProject" -TypeName "Bug" | Select-Object -ExpandProperty Fields

Or use the REST API:

GET https://dev.azure.com/{organization}/{project}/_apis/wit/workitemtypes/{type}/fields?api-version=7.1-preview.2

2. Update Target Process

If fields are missing in the cloud process:

• Go to Organization Settings > Process > [Your Process] > Work Item Types
• Add the missing fields manually
• Ensure field names and reference names match the source

3. Re-run Migration with Field Mapping

Update your migration config to include field mappings:

{
  "FieldMapType": "FieldToFieldMap",
  "SourceField": "Custom.OldFieldName",
  "TargetField": "Custom.NewFieldName"
}

You can also use FieldToFieldMultiMap for multiple mappings.

4. Use WorkItemTypeMappingTool (if types changed)

If work item types were renamed or restructured, map them explicitly:

{
  "WorkItemTypeNameMap": {
    "Bug": "Defect",
    "Task": "WorkItem.Task"
  }
}

5. Enable Analytics for Retrospective Reporting

Once fields are restored, enable Analytics Views in Azure DevOps Services to build retrospective dashboards and reports.