From Trainers: If a district is transitioning to Flex for the first time and they copy over MST each, they must reach out to support for the conversion. So if they select the Flex option - a popup should appear that states something like, "If transitioning to Flex the copy MST feature is not enabled. Select the Scheduling Students into classes for Next Year option and contact support to enable for Flex". Also, if converting to Flex for the first time, the Copy MST should be disabled and not an option.