How to utilize an IP camera with octopi properly? It won't load my mjpg stream?

Camera model
Wyze V2 camera with openmiko firmware openmiko/openmiko: Open source firmware for Ingenic T20 based devices such as WyzeCam V2, Xiaomi Xiaofang 1S, iSmartAlarm's Spot+ and others. (github.com)

What is the problem?
Whenever I put a stream URL into the webcam fields it never finds the stream, but the link on the error page works when I click on it. I have tried a blue iris mjpg stream as well as this new firmware mod for the Wyze V2 camera. No usernames or passwords - direct normal link. Openmiko is supposed to be octopi compatible.

URL to my camera I use in the stream field is: http://192.168.3.215:8080/?action=stream
URL for snapshots DO work - http://192.168.3.215:8080/?action=snapshot

What did you already try to solve it?
Multiple known working mjpg 2 streams do not load in octopi at all

Logs (/var/log/webcamd.log, syslog, dmesg, ... no logs, no support)
I do not see anything in the webcamd.log file - but I do see some data in webcamd.log.1 - but it does not have any errors or information regarding the correct IP - just previous tests with other webcams...

Syslog
has a line about uncaught malformed URL. Cannot determine stream type. - URL: https:///static/webassets/packed_core.js?0d093a46 - Line: 1218 - Column: 435 - Error object: "Malformed URL. Cannot determine stream type."#033[0m
next line says same thing but starts with octoprint.JsFrontendErrors(Dash) before repeating the same statement.

Additional information about your setup (OctoPrint version, OctoPi version, ...)
Octoprint 1.7.3
Octopi 18.0

I have installed the multicam plugin from the default repository and cannot get it to work with that either - but my logitech brio webcam that is plugged into the pi directly does work with the URLs:

http://:80/webcam/?action=stream
http://:80/webcam/?action=snapshot