I was transferring my swarm of the raven from my hunter to my warlock via the destiny 2 companion app. The ui bugged a bit and said something like "item cannot be transferred". When I refreshed the page it said that the gun wasn't on my hunter nor warlock and I would like it back.
Thanks for reading
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Have you checked your Vault? Whenever an item gets moved, it always goes from the first character, to the vault, and then to the target character. If the target character does not have enough space, or if there’s a communication error, the item may simply get held in the Vault.