After upgrading from Symantec Endpoint Protection Manager (SEPM) 11 RU6MP2 to 12.1 RU1 an error occurs during the management server configuration wizard.
Policies were deleted from the Policies page for Intrusion Prevention, Firewall, and Application and Device Control.
Add a new Default Policy to each policy section that had policies missing. They do not need to be applied to any groups. This allowed the Management Server Configuration Wizard to finish and the migration to complete.
Please make sure to repeat these steps for all SEPM domains.
Note: In order to make this change, the failed 12.1 SEPM install may have to be uninstalled and the previous version reinstalled to restore the database and make these changes.