When I look at https://apps.garmin.com/en-US/ under the "Sensors and Displays" section the 1st app (https://apps.garmin.com/en-US/apps/7c83d402-4b68-4f0a-b167-7139788a19b3) has no icon:
[see in comment, because forum bug doesn't let me post the image here]
When I open the "icon" in another tab (https://services.garmin.com/appsLibraryBusinessServices_v0/rest/apps/7c83d402-4b68-4f0a-b167-7139788a19b3/icon/582855cd-9c41-4306-892d-efb530f82f73) I see the following:
{"error":"FileNotFoundException","errorText":"Icon with iconFileId=582855cd-9c41-4306-892d-efb530f82f73 does not correspond to appUuid=7c83d402-4b68-4f0a-b167-7139788a19b3"}
