I’m trying to play the 2v2 ladder with a friend, but their name isn’t showing up in the list of players I can send a ladder request to. I can send it to other friends, but not them.

I checked the wiki and as far as I can tell they should be eligible to play on the ladder.

Here is their profile: https://www.warzone.com/Profile?p=51119004570

You unlock the 2v2 Ladder at level 51

Ah thanks. I was looking at the 2v2 Ladder page instead of the general ladder page of the wiki.