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When I share Looker Studio reports using unlisted links, some users get the following error message:
We are sorry, but you do not have access to Looker Studio. Please log in to your Admin Console to enable it.
They get an error message even after I added their email address to users who can access the report.
Hope this will be fixed soon.
I am experiencing the exact same issue. Did you find the route cause of this?
The issue here is not anything you can control with report sharing. The issue is that users do not have permission to use Looker Studio on the admin console end. Here's more information about enabling services such as Looker Studio from the admin console.