Me and my friends did Lake of shadows legend NF multiple times and defeated all champs even tho we cant get Platinum result at end. Every time we are ending up with Silver result. We cant progress to Guardian rank because of this
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In the [url=https://www.bungie.net/en/Forums/Post/262690050]Known Issues thread[/url], there is an issue if you wipe in the boss room: [quote]• In the Lake of Shadows Nightfall, wiping in the final boss room will cause some enemies and Champions in a previous room to respawn, blocking Platinum rewards.[/quote] This may be why you are not achieving platinum rank.