While this is a relatively easy maneuver, there are a couple of caveats that might be discouraging to many: Finding a suitable and good-looking custom icon online can lead to unending Google searches.
In its latest stable app update, v1416, Microsoft Teams for Android now supports themed icons. Just toggle the theming option on your homescreen’s settings and the icon will match your colors. The ...
The new change utilizes main app icons and there's also monochrome versions as well. Google could just be toying with this, and it's unclear when and if this feature will come in a future update.