I want to export the .tde file to the Tabulea server but am unable to export the .tde file to Tableau Server.
Without knowing more information about the exact error you are seeing it's difficult to say what the issue is.
.tde format has been deprecated, see: https://www.tableau.com/about/blog/2018/1/onboarding-your-team-hyper-79398
So has our plugin that supports .tde export is also deprecated. https://www.dataiku.com/product/plugins/tableau-export-v2/
So to start with I would suggest you use the latest plugin support hyper instead and see if you still have the same issues https://www.dataiku.com/product/plugins/tableau-hyper-export/