I cannot find the default user/pass for Fedora 35 ARM aarch64 anywhere on the web. I downloaded the image from here:
11 Answer
@ mashuptwice is right; there is no default password. However I installed this on a Raspberry Pi 4 compute module, and when it booted, it came to a menu with options to set a user/root password/timezone. But stupidly, it also gives you the option to 'quit'. when you quit it just goes to a boot prompt asking for a username/password. There is no fix for this, no way to get back to that setup menu, so it has to be reinstalled at that point. It's a terribly flawed design.