Amazon Quick Flow Application Actions step shows blank connector/action even though integration status is Available

I created a new app integration for Actions in Amazon Quick. The integration appears under Existing Actions and its status shows as Available.

However, when I create a Quick Flow, add a step, and select Actions / Application actions, both the Action connector and Action fields appear blank. I also get the following validation error:

"Please fix the following errors to run, share, or publish changes to your flow Action connector required, Action required in Action"

I am trying to understand what could cause this behavior and how to resolve it.

Specific questions that I have:

• Why would an action integration show as Available under Existing Actions but still not appear in a Quick Flow Application Actions step?
• Are there additional requirements such as admin enablement, permissions, sharing, publishing, or authentication that must be completed before the connector becomes usable in Quick Flows?
• Are some action connector types supported only in Quick Automate and not in Quick Flow?
• What troubleshooting steps would you recommend to determine whether this is caused by a permissions issue, connector configuration issue, or a product limitation?

Any guidance would be appreciated.