foundry: Verifying contracts on optimsm doesn't work on Optimism

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (6130af7 2022-04-06T00:04:11.858449+00:00)

What command(s) is the bug in?

forge verify-contract

Operating System

macOS (M1)

Describe the bug

Trying to verify an optimism contract with:

forge verify-contract --chain-id 69 --num-of-optimizations 1000000 --constructor-args < abi-encoded-args > --compiler-version v0.8.13+commit.abaa5c0e < contract-address > < path:contract > < etherscan-key >

does not work. When verifying the verification I get the message below which is not very telling. Not sure what could be wrong, followed the docs very closely.

Error: 0: Contract verification failed: Response: NOTOK Details: Fail - Unable to verify