Partners using a super admin account are not able to manage their clients XG firewalls through Central Manager.
An error "403: You're forbidden from making this request." is shown when trying to click on a firewall to manage.
You can use an account with a level of "admin" instead of the "super admin" account level.
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[UPDATE] This issue should now be RESOLVED. If you are still experiencing this issue, please call in to Support so we can investigate further. Sorry for any inconvenience caused.