Actually, I think you nailed it. Tried baking out the texture, not the object, and got the message "couldn't find UV tag". Here is the project, if you'd like to take a look. I modelled the character in Zbrush, brought it over to C4D, textured it, and added a few things. The object I tried baking is called Barbarian v4 in the object manager.
https://we.tl/t-h4U5kVxF47
Thanks for the help.