They fixed it in version 6.2.4
also see: key base completely not working today? · Issue #4226 · keybase/keybase-issues · GitHub
if you have any issues you could install it from here:
https://prerelease.keybase.io/
sadly, there’s no build for arm64, if one of the maintainers could provide this, I would be very glad 
Is one of the keybase projects packaged by fedora?
Are you asking for an update of a fedora package?
sorry, please ignore me, there is no package from fedora. I forgot, that I installed it manually
rpm -i keybase-client-6.2.3-1.1.aarch64.rpm
I prefer to use dnf to install not rpm. dnf will install from a local file.
Not sure if rpm -i will show up in the dnf transaction history that is useful when investigating issues with packages.
for anyone that has the same problem: https://download.opensuse.org/ports/aarch64/tumbleweed/repo/oss/aarch64/keybase-client-6.2.4-1.1.aarch64.rpm works fine for me
I used the repo here