Show Activity Summary Generative AI action does not give any output

Summary:

As part of AI features enabled the Show Activity Summary action but it is not giving any outputs even though there activities associated to the Opportunity/ Account. Is there any other configuration we need to perform apart from enabling the features and the smart action.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):