I must receive 2 BTC on this address but the person is unreachable and the address was created online
Why did you have to receive it here? Did someone tell you to? How did the address created in the first place?
I think it's better if you download Electrum, run it offline and then make your own Bitcoin address. If someone somehow suggests that this address was yours and you need to give it when you receive some payment, it's strongly possible that you'll get scammed.
As other members have pointed out, this address has been used before and it means someone else other than you have the private key. Or, you're an alt of the previous owner. I'll assume this is not the case, so I suggest you learn or read a little bit about Bitcoin wallet address and how we can generate it, for example from this article.[1] I kinda get the feeling that someone doesn't give you enough information about Bitcoin address in general and use that to scam you. Sorry if I'm wrong though.
[1]
https://medium.com/coinmonks/how-to-generate-a-bitcoin-address-step-by-step-9d7fcbf1ad0b