My application icon is not full

I’ve read several documentations about application icon size resolutions, but even though I set a resolution within the standards, my icon isn’t complete, because it has a margin. I would like it to be complete without this white part, (below are the prints):
I have already tested these resolutions:
600x600
1152x1552 and the same result remains.
No matter the resolution, it always has this white border, I would like it to be complete, that is, all black. Note. I’m downloading it directly from the thunkable website to test on my device

Can you share the icon image file you’re using?

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Here’s the icon I’m using