its black and green because you made the model that way
the fact you got it to rig is impressive... bet that took a few retries and boils down to using nodes to make your model which Mixamo doesn't understand because they are not part of the Fbx standard [in so far as we pretend its a standard]... sometimes it sees these as bones and other times it just ignores them, which is why you get the default error
use some other software to make your models or convert everything to the older standards or better yet stop using Mixamo and move to something more up to date like Akeytsu
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