Duplicati Container Run As Non Root User

I am trying to run the Duplicati container. When I run it as root it runs fine, however when I run it with a non root account it errors and restarts.
I gave the non root user owner and group rights over the config volume but it didnt help.
The main error I am seeing is as below:
A serious error occurred in Duplicati: System.UnauthorizedAccessException: Access to the path “/tmp/HttpServer” is denied.

Does anyone have any ideas about this please?