One of the causes of Microsoft Teams showing broken images for Output HTML control or image output: network issueIssue If the image is publicly accessible and still Microsoft Teams is showing a broken image then it is possible that URL is getting blocked by network. When we send the payload to Microsoft Teams then they will modify it and show the image using some Microsoft specific URL in which the URL which we sent out is a parameter. e.g. https://urlp.asm.skype.com/v1/url/content?url=<imageURL>CauseCustomer will need to check if they are blocking this URL in their network.How to check: They can open the teams in web browser and inspect the broken image to get this URL. Once you know the URL, just try to open it in another tab and check if the image is loading or not. If it does not load then customer network admin needs to allow the access properly.ResolutionCustomer network admin needs to look at the access rules and unblock the URL.