Dragonseeker420

So I was having this problem with steel resolve also. Couldn't find the letter by the tree already talked to the lady at the gate and still nothing. Went back to talk to ranger casagrada and he wouldn't trigger the mission. So I went on the litte patio behind him, read a letter on the floor and then while still on the patio I tried to talk to him from up there and for some reason it triggered the mission. I am now progressing. Couldn't say why it worked but it did.