Follow these steps:
- 1. (skip if you have the wallet) Restore your Electrum wallet using the seed and the same steps you've mentioned.
- 2. Open console tab (View->Show Console) and type getmasterprivate().
- 3. Copy the master private key (yprv) and paste to iancoleman's "BIP32 Root Key".
- 4. Select BIP141 tab and select "P2WPKH nested in P2SH" in the 'Script Semantics' drop-down menu.
- 5. Check the addresses, it should be the same as Electrum's.
If @21sats used only step 1, he already has native segwit right?, step 4 must be select
P2WPKH not
P2WPKH nested in P2SHanother way if @21sats select legacy in begining, must be select
BIP 32 to same with electrum legacy address