There are a couple of different ASUS dongles that match AC1200, could you try to get some more info, maybe a physical description?
If it’s the USB-AC53 nano, then that seems to use the RTL8812BU chipset. There are two driver options, rtl88x2bu and rtl8822bu (former seems to be better), and unfortunately of them are available packaged for Fedora.
If you really want to get it to work you could maybe take a look at creating akmods, e.g. the Broadcom spec file (most of it is just patching and changelogs), but tbh it would probably be easiest to just get another dongle.