Rigging Issue with Model from Mixamo

Hey Everyone was working on a tunic, for a game I’m wanting to make. I used Mixamo to rig the model for the Player. In the game there is suppose to be tunics you can buy your character, I tried rigging it to the same skeleton as the model rigging in Mixamo .And I keep getting this :

"FAILED TO MERGE BONES:

This could happen if significant hierarchical changes have been made
e.g. inserting a bone between nodes.
Would you like to regenerate the Skeleton from this mesh?

WARNING: THIS MAY INVALIDATE OR REQUIRE RECOMPRESSION OF ANIMATION DATA.
"

Anyone have any Idea how to get these bones to match, for they are same skeleton, but for some odd reason I keep getting this. If anyone has been through this before please give me a pointer about what to do. Thank you,
Lastonestanding

I’m having the same error when trying to export a two-hand rig to UE5 from Blender. They’re just floating FPS hands and I can’t figure out why I’m getting that error