You’re running into two different but related issues: authentication on the training “Journeys” app, and occasional login errors on the ODC portal.

From similar reported behaviors, what’s likely happening is:

1. Training / Journeys app using a different auth flow than the forum/portal
   Some OutSystems training apps (including AI-related ones and older Journeys apps) use internal user tables or a specific identity provider instead of the same mechanism as the forum/portal. That can cause:

   • “Invalid username or password” in the training app even though the same credentials work in the portal and forum.
   • Situations where your OutSystems account exists, but the corresponding “end-user” record used by the app is missing or not synchronized. From-o11-to-odc course: Invalid credentials trying to login to Directory app

2. OS-COMM-61004 on ODC portal
   This is a communication/auth error on the cloud side, not a mistake in your password. It has been seen intermittently and typically requires OutSystems Support to check what’s going on in the tenant or identity provider configuration.

Given that you previously accessed “Become an AI Developer” and now can’t, the issue is almost certainly on the platform side (identity/session) rather than your account.

What you can do right now

Because this is a hosted training app (https://apps.outsystems.app/Journeys/MyJourney), you don’t have access to its logic to apply the usual workarounds yourself. The best path is:

1. Open a Support case with OutSystems

   • Explain that:
     • You can log in with the same credentials to the OutSystems forum and portal.
     • You get “incorrect username or password” when accessing the Journeys app for Become an AI Developer at https://apps.outsystems.app/Journeys/MyJourney.
     • You sometimes see OS-COMM-61004 when logging into the ODC portal.
   • Mention that you had already started the learning path before, so something changed later.
   • Reference that similar issues have already been resolved by OutSystems when something was wrong in their training database or identity setup. Problems with "BECOME AN AI DEVELOPER" Course - OutSystems

   In a previous case for this exact journey, the user contacted OutSystems and the problem on the training backend was fixed by them; nothing on the client side was required. Problems with "BECOME AN AI DEVELOPER" Course - OutSystems

2. Try access from a clean browser/session while you wait This won’t fix backend issues, but can rule out local problems:

   • Use an incognito/private window.
   • Try another browser (e.g., Edge instead of Chrome) and go first to https://www.outsystems.com to log in, then open the journey link.
   • Clear cookies for outsystems.com and outsystems.app if you suspect stale sessions; similar behavior was seen with other courses and was temporarily fixed by switching browser. Why can't I access courses content?

3. Check if you can access other ODC training apps

   • If other ODC-related training apps work fine but only “Become an AI Developer” fails, that strongly confirms a problem specific to that journey’s app or its user records.
   • Include this information in the Support request; it helps them pinpoint whether it’s a global identity issue (OS‑COMM‑61004) or a single training app issue.

Why you need Support intervention

For regular ODC apps in your own environment, there are known workarounds, such as:

• Using the Built-in Community Provider and logging in with your OutSystems account via SSO.
• Leveraging an existing app that already has the community provider and reusing that session. Unable to log in to AI Agent Builder with ODC Personal Edition

Or for the O11-to-ODC training apps, you can create a new app and copy the working login logic. From-o11-to-odc course: Invalid credentials trying to login to Directory app

But the Journeys/MyJourney app is owned and maintained by OutSystems, so only they can:

• Fix broken foreign keys or user records in the training database (as happened before on another course). Problems with "BECOME AN AI DEVELOPER" Course - OutSystems
• Adjust the identity provider configuration used by that journey.
• Investigate OS‑COMM‑61004 coming from your tenant.

In summary: from your description and existing reports, the issue is almost certainly on OutSystems’ side, not your credentials. Open a Support ticket, describe both the journey login error and OS‑COMM‑61004, and they should be able to restore your access so you can complete the “Become An AI Developer” learning path.