Root Bones Missing?

Hello there. I’ve been at this for 7 hours and can’t seem to fix my problem. I was able to import my character from CC3, as well as her animations and got everything to work PERFECTLY. My character was able to move around and such with its proper animations. Today I imported a FBX character that I got from Mixamo and I was prompted to update something. I can’t remember what exactly and I clicked yes, but it gave me an error and now, no matter what, my animations stopped working. When I try to import my character again, the IK bones are greyed out. Before, it just automatically would match my animations as long as I chose this skeleton. I’ve tried restarting and I still get the same results.
I even tried importing the animations alone and using that skeleton rig and still those bones appear greyed out.
Any help would be greatly appreciated.