No, i only have saved private 1. address, now when check from other 2. address is showing me 400UNI, but if i click claim, it will send them to 1. address.
hope you understand

How did you create the "account" /address? Did you not have access to the private key from the start?
How do you know you don't have the private key?
He has two Metamask wallet.
Wallet 1 - Lost access
Wallet 2 - Used it to check if wallet 1 is qualified
Uniswap allows wallet 2 to view if other addresses have 400 UNI to claim. If what he said is true that wallet 1 has 400 UNI, he cannot claim it using wallet 2.