[REGRESSION]: AzureFunctionApp@V2 2.66.0 Broken

[johnmwork]

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• I searched for existing GitHub issues
• I read pipeline troubleshooting guide
• I checked how to collect logs

Task name

AzureFunctionApp

Breaking task version

2.66.0

Last working task version

2.64.0

Regression Description

There's a syntax error in msal-node.cjs that's causing the the AzureFunctionApp deployment task to fail.
It looks like it updated to 2.66.0 today.

2025-12-15T16:50:22.6360318Z ##[error]Unhandled: Unexpected token .
2025-12-15T16:50:22.6379272Z ##[error]C:\azagent\A2_work_tasks\AzureFunctionApp_501dd25d-1785-43e4-b4e5-a5c78ccc0573\2.266.0\node_modules@azure\msal-node\lib\msal-node.cjs:48
tenantProfiles: accountEntity.tenantProfiles?.map((tenantProfile) => {
^

SyntaxError: Unexpected token .
at Module._compile (internal/modules/cjs/loader.js:723:23)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Module.require (internal/modules/cjs/loader.js:692:17)
at require (internal/modules/cjs/helpers.js:25:18)
at Object. (C:\azagent\A2_work_tasks\AzureFunctionApp_501dd25d-1785-43e4-b4e5-a5c78ccc0573\2.266.0\node_modules@azure\identity\dist\index.js:5:18)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

Windows 10

Relevant log output

2025-12-15T16:50:22.6360318Z ##[error]Unhandled: Unexpected token .
2025-12-15T16:50:22.6379272Z ##[error]C:\azagent\A2\_work\_tasks\AzureFunctionApp_501dd25d-1785-43e4-b4e5-a5c78ccc0573\2.266.0\node_modules\@azure\msal-node\lib\msal-node.cjs:48
                tenantProfiles: accountEntity.tenantProfiles?.map((tenantProfile) => {
                                                             ^

SyntaxError: Unexpected token .
    at Module._compile (internal/modules/cjs/loader.js:723:23)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (C:\azagent\A2\_work\_tasks\AzureFunctionApp_501dd25d-1785-43e4-b4e5-a5c78ccc0573\2.266.0\node_modules\@azure\identity\dist\index.js:5:18)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)

Full task logs with system.debug enabled

UNSUCCESSFUL RUN

 [REPLACE THIS WITH YOUR INFORMATION] 

SUCCESSFUL RUN

 [REPLACE THIS WITH YOUR INFORMATION] 

Repro steps

[physc]

We are seeing the same error in the "Pre-job: Download secrets" task, which downloads secrets from Azure Key Vault. All our drift check pipeline have failed.

Starting: Download secrets: kv-ops

Task : Azure Key Vault
Description : Download Azure Key Vault secrets
Version : 2.264.0
Author : Microsoft Corporation
Help : https://docs.microsoft.com/azure/devops/pipelines/tasks/deploy/azure-key-vault

##[error]Unhandled: Unexpected token .
##[error]E:\agent_work_tasks\AzureKeyVault_ca9331e\2.264.0\node_modules@azure\msal-node\lib\msal-node.cjs:48
tenantProfiles: accountEntity.tenantProfiles?.map((tenantProfile) => {
^

SyntaxError: Unexpected token .
at Module._compile (internal/modules/cjs/loader.js:723:23)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Module.require (internal/modules/cjs/loader.js:692:17)
at require (internal/modules/cjs/helpers.js:25:18)
at Object. (E:\agent_work_tasks\AzureKeyVault_a9331e\2.264.0\node_modules@azure\identity\dist\index.js:5:18)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)

[PhilipsonJoseph]

Hi @johnmwork / @physc May i know the agent and node version used on your pipeline and possible could you share us the debug logs of the task ?

[Dalton-V]

I was having the same issue. Looks like my node and agent versions were behind.

Updated versions and the issue was resolved.

Node 16.15.1 -> 24.12
Agent 2.196.2 -> 4.264.2

[physc]

Hi updating the devops agent from verion 2 to version 4 solved the problem for us.

[reddyrajanala]

@Dalton-V @physc how did you all update agent?

Upgrade from Azure Devops UI added a new A2 agent

I had to run config remove command and run the registration script.
This created A3 agent folder but seems to be working. I had to do lot of manual configuration steps.

[PhilipsonJoseph]

Could any one share the debug logs of the failed pipeline. It will be useful to identify the cause

[rm-dmiri]

Hi @johnmwork, could you please provide details about the successful and failed pipeline runs? Ideally, we’d appreciate the debug logs, but at minimum the agent versions used in both cases would be helpful.

[reddyrajanala]

Could any one share the debug logs of the failed pipeline. It will be useful to identify the cause

I can send the logs - where could I find them?

[rm-dmiri]

@reddyrajanala You can run your pipeline with diagnostics enabled. And then go to failed task and open raw logs.