Customer user cannot retrieve issues thru api.asUser().requestJira(route`/rest/api/3/search/jql

Hi,
I have an environment with one user that belongs to jira-service-management-customers and jira-users groups in my environment.
It is also granted the Service Desk Customer role in a project in that environment.
From my app, when I try to make a POST request thru api.asUser().requestJira(route`/rest/api/3/search/jql (The jql contains only that project id) the user gets a 200 OK response but no issues at all

What other permissions does this user need to be able to get the issues from the api?