I need help guys.

So i recently started a server with my friend and i wanted to make a spawn in creative but the commands dont work

I have op myself and i have tryed un oping me and re oping myself and restarting minecraft but it doesnt work
I am in Vanilla 1.15.2 btw

Wdym. I went to Server Console and did /op Technic_XD . It says im op and i cant op myself because i am already op but i cant do commands.