I'm looking to migrate my users ClockKit complications to WidgetKit in my next app update. I can only do this for WatchOS 10 users because the APIs are too limited for WatchOS 9 (eg. Widget corner round text not available). But I do need to do this for WatchOS 10 users in order to get in the Smart Stack. When I tried to mark my getWidgetConfiguration method in my ComplicationController.swift with: @available(watchOS 10.0, *) it complains and says: Protocol 'CLKComplicationWidgetMigrator' requires 'getWidgetConfiguration(from:completionHandler:)' to be available in watchOS 9.0 and newer I then tried modifying my WidgetKit extension to only support WatchOS 10. This seems to work for a while but at some point WatchOS 9 devices still try the migration and crash with symbolNotFound DYLD issues for the WidgetKit extension which shouldn't even be embedded in the WatchOS 9 builds! (all visible in iPhone Analytics data crashes) So I'm not sure what else to try. I've researched a lot in docs etc... but can find no official way to achieve this.