Vex incursion question

[tacit moat]

Do I need anything more than to just beat the first neomuna mission to unlock them?

also I remember witch queen had a event that I farmed so much before I learned you needed a vendor upgrade to actually take advantage of it. Is it the same here?

[raw cradle]

I mean it's always helpful to finish your campaign before you go to do other stuff

this is so hyperspecific that probably nobody can tell you for sure. you're gonna have to check yourself