Adobe Marketing Agent MCP (aep-ai-ama.adobe.io): DCR rejects hosted redirect URI with invalid_redirect_uri

Hi, we're building an MCP client that connects our customers to Adobe Marketing Agent (aep-ai-ama.adobe.io/mcp).

Registering our hosted callbacks at /register returns 400 invalid_redirect_uri. The same request with a localhost callback works.

The callbacks are:

• Production: https://api.darcyiq.com/api/oauth/callback
• Development: https://development-api.darcyiq.com/api/oauth/callback

Two questions: How do we get these redirect URIs approved, and who handles it? Can our customers create their own OAuth app in Developer Console instead?

Thanks!