Scene Failing to load becase

I created a model in MAYA(2024) using several objects. I then "grouped" the objects together and "combined" only certain parts like the wings of the model. The first time I finished UV mapping the model I managed to get the model to load into the scene but there were issues with mesh and bi-tangent normals. I knew it was an issue with the mesh so I thought I fixed it. Second time I UV map the model I then tried combining everything into one mesh and UV mapped it anyway, still got an error. Now I've UV mapped every individual object and then grouped all objects together, but now I have an error saying "[Scene 3D] Errors have been found while splitting meshes per UV tile:
Mesh 'Entrance' has faces in out of bounds UDIM indices: [0,-1].
Mesh 'Entrance' has face(s) spanning across multiple UDIMs: [0,-1](up) 1001(down)." I also got another error code saying, "[Scene 3D] [FBX] : Mesh normals are invalid (some values are null) and will be recomputed". I went and took a look at the mesh name indicated in the Log and fixed the mesh but the scene fails to load. Someone please help I've been going back and forth with checking my UVs and the mesh but don't seem to reach a conclusion or where the problem is actually located. If someone could please take a look at what I've provided and show me the actual issue I'd greatly appreciate it. The most tedious part is that the model is intended to simply be one material/texture in Substance Painter. 

P.S this is my first time working on a more complex model.