FBX exporter sets animations to 'REST' - School Project, Please help

So I’m having a problem whenever I try to export with FBX into Unity 2019.4.18f1 from Blender 2.9 in that the animations are always set to Tpose, the set rest position I have for my model (metarig). It even sets the animations to rest position within my blender file.

This is what I’ve found when I opened the System console:

Originally I had my model and rig with animations in a separate file with other models and rigs in order to create animations with the characters interacting with each other. However, my metarig didn’t export correctly as the other character did (it had an armature that I had made).

To try to fix this, I moved the metarig character to another file, linked the animations and then made them local. I had an animation bake error with some DEF bones, but deleting the vertex groups from the character mesh seemed to fix that. I also had an issue with not all the animations going over to unity, deleting some deleted bone channels from the animations seemed to also fix that.

Now I just have the issue with being unable to change the export setting to POSE for the animations. Can anybody help?