How to disable IPV6 (Centos 8 Stream)

Hi,

I'm running "CentOS Stream release 8" and I try to disable IPv6.
Actually I see this messages:

==> /var/log/messages <== Jan 6 12:24:56 HBL01 NetworkManager[839]: <warn> [1641468296.5258] ipv6ll[386f7f8905f24c3f,ifindex=2]: changed: no IPv6 link local address to retry after Duplicate Address Detection failures (back off)
Jan 6 12:25:06 HBL01 NetworkManager[839]: <warn> [1641468306.5367] platform-linux: do-add-ip6-address[2: fe80::f03c:92ff:fea0:1fef]: failure 95 (Operation not supported)
Jan 6 12:25:08 HBL01 NetworkManager[839]: <warn> [1641468308.5389] ipv6ll[386f7f8905f24c3f,ifindex=2]: changed: no IPv6 link local address to retry after Duplicate Address Detection failures (back off)</warn></warn></warn>

It seeams IPv6 not's enabled after execute this boths commands but the error messages persists

sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1

[root@HBL01 ~]# ifconfig |grep inet6
[root@HBL01 ~]#

I try to update the file "/etc/sysconfig/network-scripts/ifcfg-eth0" to this configuration:

IPV6INIT="yes"

to

IPV6INIT="no"

but after reboot the configuration was restored.
It's possible to edit this file? Or How can I disable IPV6 from NetworkManager?

Thanks in advance