The following video goes through it in 45 seconds. Step by step below that.
Note: this does assume that the wallet address on destination is the same as source (which tends to be the case when the user can’t find their own tx)
Step 1
Use https://dashboard.tenderly.co/explorer to search the transaction hash and it will show you which chain it was on (both mainnet and testnet).
Note: for failed transactions, you can use Tenderly to show you exactly which part of the contract failed
Step 2
Head to the source chain block explorer (arbiscan in this case) and head into logs to find the destination chainId
Step 3
Find the corresponding chainId in our gitbooks: https://layerzero.gitbook.io/docs/technical-reference/mainnet/supported-chain-ids
Step 4