MS teams app not displaying the app icon

[AH123260]

Hi everyone, having trouble with a custom teams app not displaying the app icon or its so dark and hard to see  and this happend on Teams desktop and client version 

[#2]

I've never done this but most likely you're not using the right format/pixels. These are detailed here https://docs.microsoft.com/en-us/microsoftteams/platform/concepts/build-and-test/apps-package#app-ic...