Unifi Protect no camera entites with 3rd party cameras

Hello,
I got a Unifi Cloud Key+ with Unifi Protect (currently version 6.2.88). Because I don’t own any Unifi Cameras yet, I added my existing 3rd party cameras. The work fine in Unifi Protect, and show up as devices in Home Assistant, but I don’t get a entity that is providing the Camera Feed.

I configured the integration according to the docs: UniFi Protect - Home Assistant

I’ve also tried to reinstall the extension and removing and adding the cameras to UniFi Protect again. Does someone have a similar experience or a clue how to solve this problem?

Thanks!