If you’re using flatpaks and apps are not configured to skip sandboxing, each app get their own keyring and can’t access others’.

Asus seems to be supported by fwupd, at least they are listed on the vendors list, so I suppose (?) it can manage the update for you. Depending on your distro this might event be automatic by default, otherwise depending on your DE this might be available from the graphical software store or just from the cli.

If you have myhostname set for hosts in /etc/nsswitch.conf it shall take care of this for you (should be the default on most systemd distros I believe? not sure)