No image of graph in teams only

Hi there.

I have an issue where notifications aren’t showing properly in teams. The graph doesnt show but does if I click the view graph link. I have notifications set up for emails and the graph does show on them.

I am using a local webdav server. I cannot use S3 because it requires a credit card to set up an account and being a school this quite hard to do, so thought webdav would be the best bet.

I have been researching, and its leading me to think that teams cannot see the grafana server but it gets the information before the graph. But if that’s the case, why does it work on our office365 emails?