Authentication via managed identity for assign blueprint with rest api

[ancientanunnaki]

I have to assign a blueprint via Rest API

https://docs.microsoft.com/en-us/rest/api/blueprints/assignments/create-or-update#assignment-with-user-assigned-managed-identity-at-subscription-scope

How can I get token with managed identity? Managed Identity is like below:

{
"id": "/subscriptions/xxx-xxx-xxx/resourcegroups/xxxx/providers/Microsoft.ManagedIdentity/userAssignedIdentities/xxx",
"name": "xxx",
"type": "Microsoft.ManagedIdentity/userAssignedIdentities",
"location": "westeurope",
"tags": {},
"properties": {
"tenantId": "xxx",
"principalId": "xxx",
"clientId": "xxx"
}
}
The enterprise app that created with managed identity hasn't any client secret. How can I get token for assign the the blueprint via api?

Any advice would be appreciated.

[torreymicrosoft]

Thanks for the question about acquiring a token with a user-assigned managed identity in order to assign a blueprint through the REST API.

Heads-up on some important news: Azure Blueprints is being retired on January 31, 2027, with a phased wind-down starting July 31, 2026. After retirement the API, Azure CLI, PowerShell, and portal experience go away, and any definitions, versions, or assignments you have not exported are deleted (resources already deployed are not removed). Because of this, we are no longer shipping fixes or new features for Azure Blueprints.

The recommended replacement is Azure Deployment Stacks, which provides resource grouping, full lifecycle management, and deny assignment (lock) protection equivalent to blueprint locks. You can also publish your definitions as Template Specs or store them in Git for versioning.

Full details and the phased timeline are here:

• Announcement: https://aka.ms/AzureBlueprintsRetirementAnnouncement
• Migration guidance: https://aka.ms/AzureBlueprintsMigration
• FAQ: https://aka.ms/AzureBlueprintsRetirementFAQ

We are closing this issue as part of the Azure Blueprints retirement. If you run into anything while moving to Deployment Stacks or Template Specs, please open an issue in that repository so the right team can help. Thanks for using Azure Blueprints.