Generic http Camera problem

Running HA Supervised on Debian, fully up-to-date as of today.

I have an old Tenvis camera I’d like to add into HA. I have the http: URLs for both the stream and the snapshot which work perfectly in a browser, or VLC, but not in HA.

I can create a generic camera using just the snapshot, but it fails when I add the Stream Source URL:-

The URL entered works in a browser, which just asks for login details, or insert user:password@ into the URL to open directly.

So it all seems to be correct, but HA fails.

Anyone any suggestions?