Native SegWit addresses in a standard wallet in Electrum are derived using m/0'/0/ path. It is hard coded in Electrum's source code[1] and is different based on the address type.
You can't use IanColeman tool because as HCP said it doesn't work for Electrum mnemonics since they use a different algorithm compared to BIP39.
By the way you must never enter your actual seed phrase in any website ever. If you want to try these online tools then you should go to their github repository and download the source code and run it offline. If you have done otherwise you should move your funds to a new wallet since your seed could be compromised already.

[1] https://github.com/spesmilo/electrum/blob/29d13eb32f2ed26b426aef7f3ed1ddcd93a6135d/electrum/keystore.py#L1045-L1064