Unable to set NIC speed to 100Gbps on RHEL using ethtool

Issue

• Ethtool command failing to set NIC speed to 100Gbps
• NIC speed is set to 50Gbps
• Operation not supported for setting speed to 100Gbps:

# ethtool ens10f1|grep -i speed
        Speed: 50000Mb/s
# ethtool -s ens10f1 speed 100000 duplex full autoneg off
netlink error: link settings update failed
netlink error: Operation not supported