Install Bitwarden with already running Nextcloud


I’m trying to install Bitwarden on my server (Ubuntu 18.04) wich is already running Nextcloud and Quickbox. Every thing installed correctly but upon launching Bitwarden, it failed the task “Creating bitwarden-nginx”, witch I tracked down to be Nextcloud already using port 80 and 443. So I changed the port configuration in ./bwdata/config.yml and replaced them with 8080 and 8081 and restarted. This time it started correctly and told : “Bitwarden is up and running!” I then tried to access via chrome but it just told me the site is inaccessible with following error: ERR_NAME_NOT_RESOLVED. I also tried to access it localy with X2Go connection to the server but had the same result. I couldn’t find anything useful on Google. What is it I am missing? I feel it’s something simple but since I’m new to the linux environnement I’m unable to figure it out.

Thanks in advance for your help