Azure naming · Microsoft.ManagedIdentity/userAssignedIdentities

id Managed identity

User-assigned managed identity.

Naming constraints

CAF abbreviationid
Resource typeMicrosoft.ManagedIdentity/userAssignedIdentities
Length3–128 characters
CaseMixed case
Allowed charactersAlphanumerics, hyphens, and underscores. Start with a letter or number.
Uniqueness Resource group
SeparatorHyphen

Source: Microsoft Learn, “Naming rules and restrictions for Azure resources”, checked October 2026. Abbreviation from the Cloud Adoption Framework.

Example & copy-ready

A worked name for workload app, env prod, region weu, instance 001.

Example name
id-app-prod-weu-001 Valid
Validation regex for CI checks or pre-commit hooks (.NET and JavaScript) 
^(?=.{3,128}$)[A-Za-z0-9][A-Za-z0-9_-]*$
Bicep naming expression 
var name = take('id-${workload}-${env}-${region}-${instance}', 128)
Terraform local 
locals {
  name = substr(join("-", compact(["id", var.workload, var.env, var.region, var.instance])), 0, 128)
}

Azure Policy can't evaluate regular expressions, so a policy can check the id prefix but not the full format. Run the regex in your pipeline, or audit existing names on a schedule.

« Key vault Action group »

Uniqueness scope

Unique within the parent resource group. The same name can be reused in a different resource group.

Open in the name generator

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