restore multi-sig account with Electrum

[smabtc]

I have created a multi-sig wallet and I can restore that multi-sig wallet as watch-only in Electrum with the following three xpub:
xpub6C2UjQJG94jDxqyFY1a9G79CXFjyx8YpTDsExmgaz8LtLdg3iSawEiWzgHmMCi4fmXzRT5kRQwN 4NpUfGfZVwoWo2Yf3Xb7X1CjbAE8PXE7
xpub6CLinp3zs3YQYZ2ncnBVMHDdirmEnMosaRZxo5HWsLN5LzSBFrRcMTEJgw9oaxDwzLir2qNLy5R MxHrwzGFjuNWnW8Ks4vxtQVoztZVViR6
xpub6CwL3Jme6ERjmc86pq8Xi5sTnEjKRsbPcYd2Pke5h9GZR4z49ZJwazyefP5jnPZ7nfxkhwhpCWu 53qwDPuRhftxnLowWVy3x5fr1SWGHm2m

this is working and I see the test amount of 1.67mBTC.
http://d.pr/i/1ejku+

but as soon I want to restore with a xpriv instead of xpub it is not working, I'm not able to restore the same multi-sig wallet.

This is the BIP39 mnemonic of the first address (it is from a Trezor):
"demand gentle whale idle enjoy lumber enrich board brain spell nature govern smile level cube blouse safe virtual there one estate cloth awesome such"
and I calculated then the following xpriv over
https://dcpos.github.io/bip39/
xprv9s21ZrQH143K2W8KNNXGM82pHiKAavhf4P3NcLdFGyniMAYmgqxJJkY8mHQ8qmJbJi5DPrMuoHt vK7kH2ShjkuvG81Na7DGPysLcVCbWvpP

but this seems not to work. As soon I want to restore over Electrum with the following there inputs:
xprv9s21ZrQH143K2W8KNNXGM82pHiKAavhf4P3NcLdFGyniMAYmgqxJJkY8mHQ8qmJbJi5DPrMuoHt vK7kH2ShjkuvG81Na7DGPysLcVCbWvpP
xpub6CLinp3zs3YQYZ2ncnBVMHDdirmEnMosaRZxo5HWsLN5LzSBFrRcMTEJgw9oaxDwzLir2qNLy5R MxHrwzGFjuNWnW8Ks4vxtQVoztZVViR6
xpub6CwL3Jme6ERjmc86pq8Xi5sTnEjKRsbPcYd2Pke5h9GZR4z49ZJwazyefP5jnPZ7nfxkhwhpCWu 53qwDPuRhftxnLowWVy3x5fr1SWGHm2m

http://d.pr/i/1isKC+

it is not working, I get the alert "No transactions found for this seed".
So what I have done wrong in calculating the xprv based on the mnemonic seed?

Any help is appreciated and for a step-by-step instruction I'm happy to pay 10USD in BTC to your address.

[1715404330]

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[achow101]

According to the bip39 site, the seed you entered does not map to the same xpub you created the multisig with.

[ThomasV]

this xprv:
xprv9s21ZrQH143K2W8KNNXGM82pHiKAavhf4P3NcLdFGyniMAYmgqxJJkY8mHQ8qmJbJi5DPrMuoHt vK7kH2ShjkuvG81Na7DGPysLcVCbWvpP

has the following xpub:
xpub661MyMwAqRbcEzCnUQ4GiFyYqk9ezPRWRbxyQj2rqKKhDxsvEPGYrYrccZSC5eTh6rYXsKuXQYy B5wV5Xkd4Prcc7Dc5qEcHgSyd4DKxKm9

that's not the xpub you entered

[smabtc]

this is the flow I calculated the correct xpub address:
1) https://dcpos.github.io/bip39/
2) BIP39 Mnemonic entered: "demand gentle whale idle enjoy lumber enrich board brain spell nature govern smile level cube blouse safe virtual there one estate cloth awesome such"
3) in the "Derivation Path" I switched to "BIP32" and
4) as BIP32 Derivation Path I used m/48'/0'/0'
5) which get me the correct xpub:
xpub6C2UjQJG94jDxqyFY1a9G79CXFjyx8YpTDsExmgaz8LtLdg3iSawEiWzgHmMCi4fmXzRT5kRQwN 4NpUfGfZVwoWo2Yf3Xb7X1CjbAE8PXE7
6) and the BIP32 Extended Key:
xprv9y38KtmNJhAvmusk5pSoHvDdFsCdzkDmoNmZTGzgY89wjckPcZo9woQZqDw8xEKtUJ84RY5PbwP 6DQjEysNQQci5pByNrNAY2r28kQWGRAD

So with this one it is working