I've been having problems with DNS resolution in F33 as well: I use F5
VPN (work requirement).
I tried your nsswitch recipe, but got some errors:
authselect apply-changes
[error] [/etc/nsswitch.conf] is not a symbolic link!
[error] [/etc/nsswitch.conf] was not created by authselect!
[error] Unexpected changes to the configuration were detected.
[error] Refusing to activate profile unless those changes are
removed or overwrite is requested.
Some unexpected changes to the configuration were detected. Use
'select' command instead.
and the DNS still returns 'Name or service not known'
I've been successfully fixing my problem by running explicit
sudo resolvectl dns eno1 <my.DNS.server.ip>
sudo resolvectl domain eno1 <my.domain>
As to the issues with F5, I see that it rewrites /etc/hosts
#F5 Networks Inc. :File modified by VPN process
127.0.0.1 localhost localhost.localdomain localhost4
localhost4.localdomain4
::1 localhost localhost.localdomain localhost6
localhost6.localdomain6
12.34.56.78 f5.server.mycompany.com
BTW, why isn't RPM seeing that change?
rpm -qf /etc/hosts
setup-2.13.7-2.fc33.noarch
rpm -q --verify setup
.M....... c /etc/fstab
S.5....T. c /etc/printcap
.M....G.. g /var/log/lastlog
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