Our experience with "this booking already claimed"...one of the updates deleted DH's history. According to the app, he's never cruised on Princess, all his saved info disappeared, his security pix gone, etc. Contacted the "experts" and they fixed some of it, but not all. He's still a newbie and can't log in on the app (gets the already claimed notice). When I log in and switch to his account, his security photo is there. If I look at a different section and go back to the security photo...it's gone.
Definitely something is broken and doubt they'll ever get it fixed.