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Can't set MTU lower than 1280

mx flag

I'm using OpenVPN and it only works when my network interface MTU is 1200, I can change MTU to 1200 with this command with no problem:

ip link set dev eno1 mtu 1400

But as you know it's temporary, when I go to settings/network and change MTU, it will take effect and it is permanent but if I set it to any value below 1280 it will not take effect and when running this command, I see it's not going below 1280:

ip addr | grep mtu
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