Wondering if Mixamo is allowed, specifically for the animations themselves, not the models that come with the animation.

Yup. Mixamo is on the preapprovals list :)

Specifically (your question was clear but I'm answering for people who might be reading this too..): Animations *ONLY*. Mixamo models are *not* preapproved.

If you've never used it before: I recommend you upload your model to mixamo, use their rigging system to rig it, then download animations specifically designed around your model. If you *just* download generic animations they tend to break. If you're trying to use the same animation with more than one model you should upload/rig each model and re-download the animations specifically for that model. It *should* work if you apply the animation to multiple models, but it never seems to...