I can't OP myself on my own server?

[DAD_DATA]

I can't seem to OP myself on my own server. Ten minutes prior- I was able to, but I logged into lobby to help a friend because they couldn't join for some reason and soon enough- I logged back into my server and suddenly I'm no longer OP on my own server. I can't seem to /op myself either on the site with the server command. Help would be appreciated, thank you. 

[_omga]

Did you type in the correct command without typos in your server console? /op <yourname>
Are you in the correct server console?

[DAD_DATA]

1 hour ago, _omga said:

Did you type in the correct command without typos in your server console? /op <yourname>
Are you in the correct server console?

I did. I typed in /op DAD_DATA
And it just won't work. I can't even access /help without there being a warning that I don't have sufficient permissions. 

[_omga]

I really don't know, have you tried restarting your server?

[Catalysty]

Try typping op <your name> on the console without the /