DevOps readers cannot see any projects in the organisation I created. What am I doing wrong?

In Azure DevOps, I have created users with reader security permission, and basic access. But they cannot see any projects in the organisation. When they log in, they can see an organisation, but no projects, so they cannot go into anything. What am I doing wrong? All the other users have Basic + Contributor permissions/access. They can see the projects, areas, work items, etc. The ultimate goal is to set up IT staff and business stakeholders (product owners) and we want to limit the product owners from seeing all areas and tasks in the project. So we will also have to manage permissions at an Area level, once we have set up the users. But first we want them to be able see a project, hence my question above.