Microsoft Teams Notification Service - No Image

Hello all,
Hoping someone could help me fix this issue

I have set up the Teams notification service to send alarm events to my management team. This is working fine as a title and message.
However I would like to include a security camera snapshot as the image.

I have the snapshot working fine and it is saving to /config/www/snapshot.jpg, however when I add the image to the teams notification it comes through blank.

Here is my script. If I access the snapshot url in a browser it shows up fine. Hope you can help!

service: notify.teamsgeneral
  message: Test
  title: Test

I have the same issue. No solution.

Hi there, I was looking for another thing and stumbled up on this.
Might still be of help? I think in the docu I read that the image URL always needs to be https ?