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Missing 32-bit libnss_mdns.so.2 library: This library is needed for network and Internet access. Installing it is strongly recommended.

Updating Subscription Management repositories.
Last metadata expiration check: 14:58:21 ago on Tue 19 Dec 2023 10:21:29 PM CET.
Package nss-mdns-0.15.1-3.1.el9.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete!
[deaktamas@tdeak ~]$ uname -a
Linux tdeak 5.14.0-362.13.1.el9_3.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Nov 24 01:57:57 EST 2023 x86_64 x86_64 x86_64 GNU/Linux
[deaktamas@tdeak ~]$ 

The package you're looking at is the 64-bit (x86_64) version. You need a 32-bit (i386) version. It might be tricky to get hold of this. I don't know if there any RHEL 9 compatible systems that do 32-bit builds anymore (like CentOS 7 has an i386 AltArch build).

LMDE Linux Mint Debian Edition still supports a 32-bit dist.
Linux Mint Debian Edition.

When you get to the downloads page select 32-bit at the top of the download mirrors list.

If it helps on Fedora 39 I had to install libxcrypt-compat to fix this issue and that worked for me. This didn't show up as missing when using cxfix or cxdiag but it did show up when looking under Help > System Information in the CrossOver interface.