Corporation creation/establishing problem

I have recieved some PRO days as a gift. I wanted to establish a corp. I tried, but it said “you need PRO licence”, yet I have it, I could do other PRO stuff like accepting contracts.
I tried a bunch of times and it somewhat accepted, it took the money.
But then it returned the money, and now it says that “this code is already taken”.
The CO command shows that I’m not in the corp though. And CORPS says such corporation doesn’t exist.
Is this normal, does this happen often to other people? What do I even do in this situation? Please help :confused:

Everything related to corporations is a bit finicky, it’s a part of the code base that is rather old and has not seen any updates.

What was the name and code you tried? Can you try again with another code?

The problem is that I was thrilled to create exactly this code and name, I designed whole visual and ideological background for it 4 months ago and have been waiting from then, I was lowkey afraid someone would take the code before me.
The code I wanted is COST.
I am zix2421 in Discord btw.