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This post has me scratching my head a little bit…it just doesn’t quite make sense to me. How did you „add account“ in Metamask, exactly? What this should look like with a Ledger is that you return to the „Connect Hardware Wallet“ flow, connect up to the device, and add some additional accounts by selecting some checkboxes. If you just clicked the „Create Account“ button in Metamask, this isn’t using your Ledger at all. It’s using Metamask’s seed phrase to make the next account, not your Ledger’s. Do you recall which way you made the account?
If Ledger Live’s opinion of your second account address doesn’t match Metamask’s opinion, then it’s likely true that you just made a new Metamask account. You’ll never find that account in Ledger live since it belongs to Metamask, and isn’t on your Ledger device.
As u/loupiote2 mentioned there are some complexities around derivation paths that might be coming into play, but that wouldn’t happen unless you used the same seed phrase in both your metamask and your Ledger device, which you definitely don’t want to have done. Happy to keep helping just need some stuff cleared up first.