Unable to enable SRIOV for a Ethernet port

Question

I get a permission denied error when I run the command

sudo echo '7' > /sys/class/net/eno99/device/sriov_numfs

This is the error:

bash: /sys/class/net/eno99/device/sriov_numfs: Permission denied

I have enabled SRIOV in the following ways:

1. Enable Virtualization in System Setup.
2. Enable Global Sriov in System Setup
3. Enable Sriov for each ethernet port separately.

Still I am getting the same error. Also cannot find any critical error in dmseg that may cause the problem.

Screenshots:

I also tried

sudo echo 7 | sudo tee /sys/class/net/eno99/device/sriov_numfs

Any help will be appreciated.