If you are referring to getting the emblem you have to beat all of the encounters. You have only beat the crota encounter. Check the triumphs under the raid seal.
You haven’t faced Krota in Mortal Kombat. You haven’t noticed from the K?
[spoiler]In all seriousness, I do know others have this problem. Send a post on the help forum; you’ll get a better answer that way.[/spoiler]