Whenever you go into the Scarlet Keep strike it'll spawn you at Archer's Line (I think that's the name of the location I don't really pay attention to the open world) instead of the proper location at the Scarlet Keep. Hopefully this can be fixed soon for the people who are trying the get deathbringer and just for people who like the strike.
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Have you tried accessing the strike multiple times? Usually when this happens there is a public event happening near the entrance and it won't spawn you where you're supposed to spawn, and thus you can't gain access. If it didn't work once, try again to see if it works. If you've tried multiple times over an extended period of time and it still won't launch then it may be a bigger issue.