Can't Access Takedown at Maliwan Blacksite

Hey, what are the requirements for the Takedown?
We’re lvl 50 and on TVHM.
The device to activate it is outside Marcus’ store on Sanctuary but it is inactive.
Am I missing something?
How do I get this going?

You need to finish the Story first, so if you are in the middle of TVHM, switch back to Nornal.


this is what i had to do