If you are still using the legacy APPSSO service carried over from the old DualShield 5, then you must NOT upgrade to DualShield 8.
If you are upgrading a DualShield 5.x to the latest DualShield 8.x, then you must follow the guide below:
If you are upgrading a DualShield 6.x or 7.x to the latest DualShield 8.x, then you must follow the guide below: