So after doing a bunch of troubleshooting (rebuilding aud.ini, removing/re-adding plugins, etc) I think I found solution albeit strange.
I pressed the PDC button and tried the export and VOILA it worked. I then then tested further and pressed it again (to return it to its original state) and it still worked.
One note I need to add. I did get a dialogue box at one point about the sample rate being wrong for my UAD plugs. I’d never seen that before and honestly aren’t sure why I got that.