How to List Assets in a Folder Using AEM Assets Author API with OAuth Web App?

We're doing a POC for a multi-tenant SaaS application that integrates with Adobe Experience Manager as a Cloud Service to enable bulk asset import functionality. Our application uses OAuth Web App authentication to access the AEM Assets Author API on behalf of authenticated users.

Core Requirement:

Our application needs to:

1. Browse AEM folder structures
2. List assets within selected folders
3. Retrieve asset metadata (title, description, tags)
4. Download original asset binaries

Current Setup (Successfully Completed):

• ✅ OAuth Web App credential configured in Adobe Developer Console
• ✅ Scopes: openid, AdobeID, aem.assets.author, aem.folders
• ✅ Client ID allowlisted via api.yaml deployed through Cloud Manager Config Pipeline
• ✅ User assigned to "AEM Assets Collaborator Users" Product Profile with "AEM Assets API Users" service enabled
• ✅ OAuth authentication flow working (successfully obtaining access tokens)
• ✅ Able to list folders using: GET /adobe/folders 

Issue - Unable to List Assets:
adobe/assets?limit=10&offset=0
adobe/folders/{folderId}/assets

Requests include required headers:

• • Authorization: Bearer <valid_access_token>
  • X-Api-Key: <client_id> 

Error:

{

    "type": "https://api.adobeaemcloud.com/adobe/meta/errors/not_found",

    "title": "Not Found",

    "status": 404,

    "detail": "No RequestProcessor can handle this request.",

    "requestId": "53f8ac2e-46b3-48cd-ab55-c7aed8f29125"

}