Parse new azd auth error formats in AzureDeveloperCliCredential

[JeffreyCA]

Fixes Azure/azure-dev#7859 (parent: Azure/azure-dev#7728)

Related:

• Azure/azure-sdk-for-go#26590 - equivalent Go fix
• Azure/azure-sdk-for-net#58616 - equivalent .NET fix
• Azure/azure-sdk-for-js#38416 - equivalent JS fix

Description

Starting with azd v1.23.7 (PR Azure/azure-dev#6827), azd auth token changed its stderr error format from the legacy consoleMessage JSON to a structured {"error":"..."} JSON object. The stderr output may also include an extraneous empty consoleMessage line preceding the error (fixed in v1.24.0 via Azure/azure-dev#7701).

This PR updates AzureDeveloperCliCredential error parsing to handle all three formats:

azd version	stderr format
pre-v1.23.7	{"type":"consoleMessage","data":{"message":"..."}}
v1.23.7 – v1.23.15	{"type":"consoleMessage",...}\n{"error":"..."} (two lines)
v1.24.0+	{"error":"..."} (single line)

Validation

In addition to unit tests, validated manually with small Python script:

credential = AzureDeveloperCliCredential(tenant_id="invalid-tenant")

try:
    token = credential.get_token("https://management.azure.com/.default")
    print(f"Unexpected success. Token expires at: {token.expires_on}")
except ClientAuthenticationError as ex:
    pass

Without changes (v1.23.6)

AzureDeveloperCliCredential.get_token failed: ERROR: fetching token: failed to authenticate:
(invalid_tenant) AADSTS90002: Tenant 'invalid-tenant' not found. Check to make sure you have the correct tenant ID and are signing into the correct cloud. Check with your subscription administrator, this may happen if there are no active subscriptions for the tenant. Trace ID: <redacted> Correlation ID: <redacted> Timestamp: 2026-05-05 00:38:02Z

Without changes (v1.23.7+)

AzureDeveloperCliCredential.get_token failed: Authentication with Azure failed.

With changes (all versions)

AzureDeveloperCliCredential.get_token failed: ERROR: fetching token: failed to authenticate:
(invalid_tenant) AADSTS90002: Tenant 'invalid-tenant' not found. Check to make sure you have the correct tenant ID and are signing into the correct cloud. Check with your subscription administrator, this may happen if there are no active subscriptions for the tenant. Trace ID: <redacted> Correlation ID: <redacted> Timestamp: 2026-05-05 00:38:37Z

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

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• Pull request includes test coverage for the included changes.

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[pvaneck]

LGTM overall. Looks like you just need to run black formatting locally (azpysdk black) for the Analyze check. Also, with "error" being preferred, is "suggestion" also something worth surfacing still?