Default App Icons for typical D365 environment look like these.
But here’s what you can do to change these to put custom SVG icons.
Regardless of dimensions, SVG icons work everywhere. So why keep them to just Ribbons, you can even change your App Icons to SVG Icons in your Dynamics 365 implementation.
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Change the Unified Interface App Icons – D365 Demystified
One of the easiest things to do first to make your Unified Interface App look more presentable.
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