What happens is that each operating system works with the Icon one way. Usually what you see is Favicon being transformed into the shortcut icon on mobile devices.
What I tell you is to use a Favicon generator that also has the JSON Manifesto, and that generates icons for all operating systems. Here's an example. such site. It will give you a pack of images and script and you will crawl on your page within the <head>
% link
Sample code for u put the shortcuts using favicon, noting that this code should be within the <head>
of the document and images of this example at the root. OBS: images will be generated by the website engine I mentioned as an example, but there are others ...
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
<link rel="manifest" href="/site.webmanifest">
<link rel="mask-icon" href="/safari-pinned-tab.svg" color="#5bbad5">
<meta name="msapplication-TileColor" content="#da532c">
<meta name="theme-color" content="#ffffff">