DocumentationExperience Cloud KCS

AEM Forms as a Cloud Service: Author UI stuck loading due to IMS SSO issues

Last update: October 21, 2026

This article describes how to diagnose and resolve situations where the AEM Forms Author Service UI remains stuck loading due to IMS SSO authentication flow issues.

Description description

Environment

Adobe Experience Manager (AEM) Forms as a Cloud Service

Issue/Symptoms

When accessing the AEM Forms Author Service UI in certain environments:

  • The page remains stuck loading or buffering.
  • The issue affects multiple browsers and persists when using a corporate VPN.
  • No explicit error message is displayed. The UI shows repeated loading indicators and never reaches the dashboard.
  • Attempts to sign in using Sign in with Adobe (IMS SSO) may loop back to the login page or remain loading.
  • Local admin login, if available, may succeed.
  • The issue is isolated to specific environments, while other environments may work as expected.

Cause

The issue is caused by problems with the IMS SSO authentication flow, such as expired or misconfigured IMS SSO client settings in the affected environment.

Resolution resolution

Follow the steps below to resolve the issue:

  1. Access the affected Author Service UI and try signing in using Sign in with Adobe (IMS SSO).

  2. If available, try signing in using the local admin login option to determine if the issue is isolated to IMS SSO authentication.

  3. Collect diagnostic data:

    1. Open the affected Author Service URL in your browser.
    2. Open browser developer tools by pressing F12.
    3. Go to the Network tab and select All to capture all network traffic.
    4. Enable Preserve log and Disable cache.
    5. Clear existing network entries.
    6. Reload the page using Ctrl+Shift+R and wait for the loading spinner or error.
    7. Export the complete network log as a HAR file, including response content if possible.
    8. In the Console tab, capture any errors as screenshots or saved text.

  4. Review the IMS SSO client configuration for the affected environment and check for expired or misconfigured settings. Compare it with a working environment to identify discrepancies.

  5. If misconfiguration or expired credentials are found in the IMS SSO setup, update or correct them as needed.

  6. After making the changes, retest access to the Author Service UI.

  7. Verify that users can now sign in and access the Author Service UI without being stuck loading.

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