PSA: Do NOT accept affinity missions too early.

You cannot abandon Affinity or Story missions once accepted. And you can only accept a single one of them in total.

Meaning if you accept an affinity mission, even if you can't complete it just yet, you'll be blocked from progressing the story.

This is extremely infuriating as some missions ask you to go to crazy long distances, even to locations not yet accessible at your current level. Or to get a very specific resource you can only get by mining and waiting and RNG.

This happened to me. Don't let it happen to you. Ignore affinity missions when they show up (before chapter 4). Leave them for later when you have access to more places (not sure when, but just not now).