Hi,
We get this when a user tries to access the service portal but they are a managed account.
This is the only user this is happening with though - all other users are fine and are managed accounts also:
AADSTS50105: Your administrator has configured the application Atlassian Cloud (12345567a1-0000-000c-8828-0000000002d)to block users unless they are specifically granted ('assigned') access to the application. The signed in user 'jane.doe@abcd.com' is blocked because they are not a direct member of a group with access, nor had access directly assigned by an administrator. Please contact your administrator to assign access to this application.
In theory it should not be happening as they only a customer on the portal and a non-billable customer.