I watched the two hours of any creator to acquire the stand in salvation emblem but it didn't appeared in my collections. When i return to twitch drops, it says that i already collected even not appearing in game neither third party app like dim
Often you can find the Twitch emblems under the collections tab under your profile specific emblems. If it isn't there I'd make sure your account is properly linked to Twitch via the Bungie.net linked profiles tab.
Worse comes to shove you can always unlink that account, make a new twitch account and try again.