Hello. There were multiple notifications to migrate your data over to Steam. Unfortunately nothing can be done to start over on Steam and purchase your DLC again since the migration has ended on December 1st, 2020. The answer I’ll give will be the same from BNGHelp. The link below is an official Bungie source.
https://www.bungie.net/PCMove
English
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BTW that link doesn't work, so yea, im sorry, but from a company this is unacceptable.
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The link still works. What happens when you click it?
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Error Cannot read property 'characterDisplays' of null