Hardhat Etherscan plugin: "Error occurs while verifying contract .."

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Hi @Prabhakaran,

Sorry for the delay in replying. I only just came across this post.
Verification is still not as easy as it should be.

Are you able to share your contract, address on the public network, any parameters and whether optimization was used?

It looks like you have cloned OpenZeppelin Contracts rather than importing from npm. (see: https://docs.openzeppelin.com/contracts/3.x/#overview)

For upgradeable contracts we need to use the OpenZeppelin Contracts upgrade variant. (see: OpenZeppelin Contracts 3.3)

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