Hello @RLM-AP ,
You can also try using https://developer.sailpoint.com/docs/api/beta/list-identity-access-items in HTTP request action for getting list of all access items, then use compare number operator to compare content-length header value with number(for example content-length greater than 4, if content-length is equal to 4 then response is null otherwise there is response with access items).
I’ve tested and it is working for me.
-Mehul