I just opened the 150M relic, and that's not the problem, but I realized that I'm missing my free diamond when you reach 10 or more diamonds. I can't claim the reward because it's telling me that I'm missing one when I have pulled 13 of them
Oh I know what's happening. You need to get 10 natural diamond characters, and while you do have six, Vaporwave Vixen, Wulfsbane, Silent Kill, Rusty, and Rainbow Blight don't count since you evolved them.