@Vignesh Amarnathan

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Based on your description and the fact that you're using Theme-Cosmos UI, I have several recommendations that should help resolve your issue:

Solution 1: Using pyMobileSnapStart with Full Portal Parameter

The most direct solution is to use the pyMobileSnapStart activity with the pyShowFullPortal parameter set to true. This parameter is crucial for Theme-Cosmos UI since it's based on Ajax containers that require the full portal for proper functioning.

Here's an example URL structure:

https://[hostname]/prweb/PRAuth/app/[appname]_?pyActivity=pyMobileSnapStart&Action=showHarness&className=[classname]&Purpose=[HarnessName]&pyShowFullPortal=true

Replace the bracketed values with your specific application details:

• [hostname]: Your Pega instance hostname
• [appname]: Your application name
• [classname]: The class name of the landing page
• [HarnessName]: The harness name you want to display

Solution 2: Additional Parameter for React-Based UI

If Solution 1 doesn't work, you may need to add another parameter: Param.pxUseDXapi=true. This ensures the application settings are correctly configured for React-based UI, which is essential for Theme-Cosmos UI.

Your URL would then look like:

https://[hostname]/prweb/PRAuth/app/[appname]_?pyActivity=pyMobileSnapStart&Action=showHarness&className=[classname]&Purpose=[HarnessName]&pyShowFullPortal=true&Param.pxUseDXapi=true

Solution 3: Configure URL Mappings (For a More User-Friendly URL)

For a cleaner, more user-friendly URL, you can configure URL mappings in your application:

1. In Dev Studio, navigate to Records -> Technical -> URL Mappings
2. Add a new URL alias (e.g., "/portal/landingpage")
3. Configure a supportive activity that handles the redirection to your specific landing page
4. Override the pyIsAutoGenThread when rule if necessary
5. Save as the Default rule in your application ruleset

This would allow you to use a simpler URL like:

https://[hostname]/prweb/[appname]/portal/landingpage

Post-Authentication Considerations

Since you mentioned this URL is used in an external application and called post-authentication, ensure that:

1. The authentication flow is properly completed before attempting to navigate to the landing page
2. If using SSO, make sure the original request URL is preserved after authentication completes
3. Check that the user has appropriate permissions to access the landing page

Troubleshooting Tips

If you're still experiencing issues:

• Verify in your application settings that under Advanced -> UI Runtime, "React-Based UI" is selected or "Enable React-based landing page" is enabled
• Check browser console for any errors during the navigation attempt
• Ensure all required parameters are correctly URL-encoded
• Test the URL directly in a browser where you're already authenticated to isolate any authentication-related issues

References: How to open a Harness with in Cosmos User portal using a direct link? Theme-Cosmos: Open work object in Full portal on Copy sharable Link Theme-Cosmos: Configure URL Mapping