From another forum post, and this worked for a bunch of linux users already.
https://us.forums.blizzard.com/en/wow/t/linux-users-unable-to-log-in-wow51900328-329-error-after-logging-in/292402/159?u=darkodin-moonrunner
Someone mentioned TCP fingerprinting, so I tried
echo 128 > /proc/sys/net/ipv4/ip_default_ttl
which seemed to let me in.
(also dos guys don’t read this pls)