Hey there. There are contact forms for a specific range of issues, there is no contact form for this one.
The battle.net to Steam migration window ended in December 2020, it is not possible to recover anything from there now.
Also the expansions you owned there are now free to play, and the content itself has been largely removed. Things have been overhauled so much since then that even if you had migrated, you'd still have to pick up all the Light 2.0 upgrades, all your gear would be completely obsolete - even with the removal of the sunset power caps, you'd own only the version 1 or 2 armour pieces, not the modern ones with mod slots and three additional stats.
In short, you haven't really 'lost' anything.
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Isnt there a Support where i can write them? still frustrating tbh. played a lot in that year.
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Hi there! No, it is not possible to contact Bungie regarding this, as the migration period has since passed.