SK_FemaleMannequin to Mixamo Newbie

Hi beautiful, intelligent, funny and stylish people!!
Hoping that by some miracle one of you kind talented people might be able to help a total newb out with an issue (that’s probably really simple).
So I try to export out a fbx to upload to Mixamo but when I do that the model goes crazy. I’m sure I’m doing something stupid but any advice or help would be hugely appreciated.
I’m trying/failing to a personal project as a way of learning.
Thank you very much for reading and I would really appreciate any help or guidance!!

Anyone, anyone, Bueller?
Anyone please!!

Managed to solve this issue using this software if anyone else has the issue try this: