I used the app during the Nightfall and definitely did use the Vault Transfer feature. I played a little bit more and then received the error as soon as I equipped a new weapon in-game, not through the app. I'll try to experiment tonight with having the app open versus not having it open tonight. Thank you Jules! It is of course understandable that new features can cause new errors.
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The same thing happened to me last night during the weekly, and this morning/afternoon a few times. Thanks for your input!