https://bitcoinelectrum.com/creating-a-multisig-wallet/

Multisig wallet or Singlesig wallet, you always have to do three steps.
Create your wallet with seed
Backup your wallet seed
Recover your wallet to test your wallet seed backup

With Multisig wallet, the recovery process will include checking seeds of all cosigner wallets and their Master Public Keys.
If the multisig wallet created has the same address as an initial wallet has, all are good.

Creating a multisig wallet.