Why does import fail with Jira data to QuickSight?

I've generated an API token for our Jira board on our Atlassian account. After going on [New Dataset] -> [Jira] in QuickSight, the connection is validated after entering the API token. But this message appears even though I am an admin:

"The SaaS isn’t available. The URL might not be accessible, or the instance might not be available. You can check the service and try again. Contact your data source administrator for assistance."