Hello!
I'm unable to progress through the Shadowkeep story. I've got all the armour as shown here - [url]https://imgur.com/a/MzAPHMF[/url] and had the "Beyond" mission on my map, scrapped one of the armour pieces by accident and no longer have access to the mission.
I then scrapped the rest to see if that triggered anything but can't get them back at all. So now have none of the armour. Can't collect them from Eris/Collection/Postmaster.
All I can do is repeat the "In the deep mission" I also can't see the shadowkeep quest anymore in-game for some reason, I don't think I scrapped it.
Update: Looks like I had completed it without realising. Must have gone into it with a friend and not clicked on it myself.
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In the Deep is repeatable and unrelated to your issue. I norder to access the mission that requires the armor, you must have all of the armor. You can reaquire the armor from Eris or the quest for the armor from the table next to Eris. You must have all 5 pieces of armor available to equip for the mission that requires the armor.