Having searched my accounts for information where i purchased the key from, yet i can't seem to find it listed among the many that have already been successfully purchased/acquired?
I'm really not sure as to what happened and/or why, or what to do at this point?
Any further information regarding this strange message would be highly appreciated!

I will post a link with a screeshot here below (it's in Dutch but i bet you guys might know more)..

https://imgur.com/a/tYpmDfN