I just tried your exact code, putting the PHP code you pasted above in my theme’s functions.php file, and inserting the shortcode as you typed [sc id="81"] in to a page in my site, publishing the page, and it correctly outputted a value of 81 on my published page.
So something in your theme or a plugin must be conflicting with it.
Try changing to one of the default WordPress themes and testing it again, and/or disabling your plugins.
I suspect it could be a conflict because the parameter is named ‘id‘ – so you could also try using a different parameter name (eg. ‘myid‘).
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