How to recover wallet by importing private key on testnet?
Testnet uses a different address format than mainnet, you can not view or verifying anything about the mainnet on testnet, they are separate. 

You can test your method from the origin by using testnet funds instead. 

Alternatively, you can test on mainnet with a small amount of funds to confirm your recovery method is working the same as it did on testnet (which it should).