Unable to run flatpaks

[fedoranewbie (Fred Ora)]

$ sudo sysctl -a | grep max_user_namespaces

[sudo] password for d4u: 
user.max_user_namespaces = 0
$ cd /etc/sysctl.d/
grep max_user_namespaces *
# Per CCE: Set user.max_user_namespaces = 0 in /etc/sysctl.conf
user.max_user_namespaces = 0