Hi @Prabhakaran,
I assume the Hardhat Etherscan plugin doesn’t support the Binance smart chain.
It also looks like https://testnet.bscscan.com/ doesn’t currently support proxy contracts: https://medium.com/etherscan-blog/and-finally-proxy-contract-support-on-etherscan-693e3da0714b
I tried using a flattened version of the proxy to verify but was unsuccessful: https://etherscan.io/address/0x343a1cae36b1ca047b24fc2780869dc2c1b84137#code
I have previously used this process, which describes the logic, admin and the data parameters in the constructor: Verify Upgrades Plugins proxy on Etherscan