Issue Summary

The new site admin users in the centralized user management can view the portal-only customers for Jira Service Management, which is an expected behavior. However, the site admins can't migrate portal-only customers to Atlassian accounts.

Steps to Reproduce

1. Go to admin.atlassian.com. Select your organization if you have more than one(You should be the site admin and not the org admin).

1. Select Products from the header.
2. Under Sites and Products, select the site that contains Jira Service Management.
3. Under the Jira Service Management section on the nav bar, select Portal customers.
4. Next to the customer you want to migrate, select > Migrate to Atlassian account.
5. Select Migrate to confirm.

Expected Results

The site admins should be able to migrate portal-only customers to the Atlassian account, which was possible in the old user management.

Actual Results

The error message shown on UI: Something went wrong(Try again later.)

Workaround

The workaround is for site admins to reach out to org admins of the org to check if they can migrate portal-only customers to Atlassian account.