Enabling Autoneg for Flow Control is not working

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Hello Everybody
This is the output of Flow Control in a RHEL 9.2:
[root@dl360init99 /]# ethtool -a eno6np1
Pause parameters for eno6np1:
Autonegotiate: off
RX: on
TX: on

I am trying to enable Autonegotiate using
[root@dl360init99 /]# ethtool -A eno6np1 autoneg on
netlink error: Invalid argument
[root@dl360init99 /]# ethtool -A eno5np0 autoneg on
netlink error: Invalid argument
[root@dl360init99 /]# ethtool -a eno6np1

Acording with help of ethtool command:
ethtool [ FLAGS ] -A|--pause DEVNAME Set pause options
[ autoneg on|off ]
[ rx on|off ]
[ tx on|off ]

So , what is wrong? Attached a picture of the output of full ethtool.
Thanks!
Note: The link is working at 25G

FR

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