Docker - Nextcloud 18 - Talk App not found

Hello, so I wanted to setup Nexctcloud for my office. We do have FQDNs and an SSL certificate on our domain, but before configuring all that, I just wanted to check out Nextcloud’s interface and all the apps.

I ran:
docker run -d -p 8080:80 nextcloud

I logged in, went to Apps, but I can’t seem to find the Talk-App. The Search bar also tells me, that the App can not be found under the current version.

What exactly am I missing?

Thanks in advance!