How to verify upgradeable contract on amoy - polygon testnet

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Hello. I've came across the same issue but on Amoy testnet. Verifying via hardhat is not supported yet, so I tried flattening contracts and using the UI to verify (oklink. com/amoy/verify-contract-preliminary), but it doesn't work.
Could you please help on this issue @frangio

The issue is with: ProxyAdmin and TransparentUpgradeableProxy

ProxyAdmin: 0x8445Ff5363e06D650b43C7a4c3eB306Be1491CBE
TransparentUpgradeableProxy: 0x58D35CD04B51E1710725Bbf52c85d8E26D513be0

Thanks!