Nextcloud Talk app Could not establish a connection A TURN server?

Should I install coturn to nginix server which is the where the public IP is pointing to ?

I am not sure where to install actually.

I have ngnix behind the router, then nextcloud is behind nginix on 2 different VM’s.

After reading your link and many others it seems my setup might be more complicated.

Are you running your nextcloud just behind router or also behind another proxy etc. ?

Please advise