So, since i already have Osiris and Warmind for Destiny 2 and I've already migrated accounts, how should i go about purchasing forsaken? and if i can purchase it, will it migrate to steam since i've already migrated? are any other purchases from today(the day i migrated) and the day that the game switches to steam going to be migrated too?
You need to purchase forsaken on the platform you play on as it doesn't transfer between platforms. Buy it on steam and you'll be given the year 2 annual pass alongside it however that doesn't include shadowkeep or the year 3 annual pass