Verification of Proxy and ProxyAdmin failing using Hardhat

When using Solidity 0.8 in the contract and importing import "@openzeppelin/contracts/proxy/utils/Initializable.sol" The contracts do get compiled in Solidity v 0.8.

However, when attempting to verify the contracts using npx hardhat verify --network <networkName> <address>

Getting the following error:

Error in plugin @nomiclabs/hardhat-etherscan: The bytecode retrieved could not have been generated by any of the selected compilers.
The expected version is 0.6.12.
The selected compiler version is: 0.8.0

Possible causes are:
  - Wrong compiler version selected in hardhat config.
  - The given address is wrong.
  - The selected network (kovan) is wrong.

While digging through the fx upgrades.deployProxy it is importing:

import AdminUpgradeabilityProxy from '@openzeppelin/upgrades-core/artifacts/contracts/proxy/AdminUpgradeabilityProxy.sol/AdminUpgradeabilityProxy.json';
import ProxyAdmin from '@openzeppelin/upgrades-core/artifacts/contracts/proxy/ProxyAdmin.sol/ProxyAdmin.json';

It appears that the Initializable contract at node_modules/@openzeppelin/upgrades-core/contracts/Initializable.sol is suited for pragma solidity >=0.4.24 <0.7.0; Further, the contracts over here https://github.com/OpenZeppelin/openzeppelin-upgrades/tree/master/packages/core/contracts/proxy are also suited for pragma solidity ^0.6.0

I believe this is the reason why I am not able to verify the contracts.

Link to github repo: Sample Github Repo

[frangio]

The contracts are verified now. Sorry about the inconvenience. Should be automated very soon.

[frangio]

Please refer to our guide How to verify a contract on Etherscan/BscScan/PolygonScan, particularly the section about proxies.